The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > Info Center > FAQ Truck Tech > 67-72

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-17-2011, 08:10 PM   #1
lolife99
Old Member
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,415
"Drum to Disc" Conversion FAQ 60-70

Drum to Disc conversions 60-70
__________________
Keith
Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
WTB: Radio Delete Plates and clips.
lolife99 is offline   Reply With Quote
Old 01-17-2011, 08:10 PM   #2
lolife99
Old Member
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,415
"Drum to Disc" conversions 60-62

DRUM TO DISC CONVERSIONS 60-62

60-62 truck with:

63-70 Crossmember Installed
1) The 60-62 trucks have a torsion bar front suspension, which requires swapping the entire 63-70 crossmember and all it's components.

2) A better option would be to swap out a complete 71-72 or 73-87 crossmember to take advantage of the factory disc brakes.


Links:
*Replace Your Drums With Discs-Article by Brian McCormick
*Disc brake upgrade- Article by Early Classic Enterprises

*********************************************************
*********************************************************

60-62 truck with:

71-72 Crossmember Installed
1) Your truck's donor 71-72 crossmember came from the factory with disc brakes.

2) "Year Specific" 71-72 drop spindles are readily available.

3) All spindles and rotors are the HD version (1-1/4" wide).
* This will require matching HD calipers.

4) Steering linkage contains 11/16" diameter tie rods.
* Inner Tie rods are LH thread.
* Outer Tie rods are RH thread.
* Inner Tie Rods are a "2-year only" tie rods. (71-72 only)
* Outer Tie Rods are a "2-year only" tie rods. (71-72 only)

5) Steering Linkage:
* All 71-72 oem linkage will work with 71-72 "year specific" drop spindles.

6) A-arms have steel bushings.

7) 71-72 crossmembers have the steel brake line connect the rubber brake line on the front side of the crossmember.
* Steel reproduction brake line sets are specific to the 71-72 design.
* There is also a tab welded to the front side of the crossmember, at the location where the steel brake line joins the caliper's rubber brake hose.

8) Rubber brake hoses are a "2-year only" item. (71-72)

9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels on your 60-62 truck.
* Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion.
* You will need to use a set of steel wheels found on the later 73-87 4x4 trucks.

*********************************************************
*********************************************************

60-62 truck with:

73-87 Crossmember Installed
1) Your trucks 73-87 donor crossmember came from the factory with disc brakes.
* Using the 73-87 crossmember allows for upgrading to 73-87 style rubber bushed a-arms.
* Most replacement parts are more affordable than the "2-year" specific 71-72 model trucks.
* Plus most auto parts stores keep these parts in stock.

2) Drop spindles are readily available,... but there are two versions that must match the two rotor versions below:

3) Rotors: There are two different widths of rotors available on the 73-87 model trucks.
3.1) HD or Heavy Duty rotors: (1-1/4" wide version) available from 73-87
* These will require matching HD bearings and calipers.
3.2) LD or Light Duty rotors: (1" wide version) available from 81-87.
* These will require matching LD bearings and calipers.

4) Steering linkage contains 11/16" diameter tie rods.
* Inner Tie rods are LH thread.
* Outer Tie rods are RH thread.
* Inner Tie Rods are 73-87 specific
* Outer Tie Rods are 73-87 specific

5) All 73-87 oem steering linkage will work with your 73-87 spindles.

6) The 1/2 ton a-arms have rubber bushed cross shafts
* (compared to the steel bushings of the 71-72 a-arms)

7) 73-87 crossmembers have the steel brake line connect the rubber brake hose through a hole originally drilled in the 73-87 frame rail.
* Using these crossmembers in the older trucks will require you to fabricate some or all of your steel brake lines.
* (63-70 brake lines connect on the rear side of the crossmember)
* (71-72 brake lines connect on the front side of the crossmember)
* Steel reproduction brake line sets are specific to the 73-87 design with their proportioning valve mounted on a crossmember in front of the engine opposed to hanging below the master cylinder.

8) 73-87 rubber brake hoses are much longer than either the 63-70 drum brake hose or the 71-72 disc brake hose.

9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels.
* To use the 6-lug rotors you must have the 73-87 HD spindles,... since all aftermarket 6-lug rotors are only available in the 1-1/4" wide version.
* Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion.
* You will need to use a set of steel wheels found on the later 73-87 4x4 trucks.

*********************************************************
*********************************************************

60-62 truck with:

71-72 Crossmember Not Yet Installed:
1)The 60-62 trucks have a torsion bar front suspension, which requires swapping the entire 71-72 crossmember and all it's components.

2) 60-62 steering linkage use a different centerlink and tie rods, compared to the 71-72 crossmember you will be installing.

3) 60-62 tie rods are 5/8" diameter,... 71-72 tie rods are 11/16" diameter (with the opposite thread direction).
* 60-62 inner tie rods are RH thread vs. 71-72 inner tie rods (that are LH thread).
* 63-62 outer tie rods are LH thread vs 71-72 outer tie rods (that are RH thread).
* It's easiest to just use all of the 71-72 Steering linkage.
* You can also use all of the 73-87 steering linkage, but you will have to change the outer tie rods to the 71-72 version to match the 71-72 spindle.

4) Rubber brake hoses:
* You must change to a disc brake style hose.
* Early Classic Enterprises, and other suspension vendors, make a "conversion" brake hose that will connect the disc brake caliper, to the original 60-62 brake hose steel line location.
* 71-72 hoses is another option. (but I haven't personally confirmed if the steel line connection is the correct size).
* Another option is to use 73-87 hoses, (cheaper to purchase), but they are much longer, and also may need fitting adapters.
* Aftermarket steel braided hoses and AN fittings is another option.
* Most likely there will be a need to fabricate a few, if not all steel brake lines.

5) Some drilling will be required to bolt the 71-72 crossmember in place.

*********************************************************
*********************************************************

Links:
*1960-62 Front Suspension Upgrade- by markeb01
*1960-62 GMC to SBC V8 motor & trans mounts- by markeb01
*1960 crossmember swap- by markeb01
*89 3/4T 'burb front-end swap to '66 C20- byHilandr451
*Lowering a '75 Shorty With Performance Online and Belltech- by Classic Trucks
*Disc Brake Upgrade Reference Thread
*CPP Modular Spindle Install

*********************************************************
*********************************************************

60-62 Truck With 6-lug Disc Brakes:

6-Lug Drum to 6-Lug Disc Conversions:
1) This 6-lug disc brake swap will include all of the above 5-lug information.

2) The only difference is the use of an aftermarket 6-lug rotor.
* These rotors are new castings.
* These rotors have been drilled with the correct 6x5.5" 6-lug pattern.
* These rotors have the correct 7/16" lug studs that match the original drum brake lug studs.

3) Several aftermarket suspension vendors sell these rotors,... such as:
* ECE (Early Classic Enterprises).
* POL (Performance OnLine).
* CPP (Classic Performance Products).

4) All 60-62 "conversion" stock height and drop spindles will work with these 6-lug rotors.

5) All 71-72 stock oem and drop spindles will work with these 6-lug rotors.

6) If using a 73-87 spindle,... it must be the HD spindle, that works with the 1-1/4" wide rotors.
* The 81-87 LD spindles will not work with these 6-lug rotors.

Links:
*http://www.earlyclassic.com/tech.asp...arly%20Braking
*http://www.earlyclassic.com/tech.asp...h%20And%20Whoa

6-lug Rotors:
*http://67-72chevytrucks.com/vboard/s...ght=Disc+Brake
__________________
Keith
Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
WTB: Radio Delete Plates and clips.
lolife99 is offline   Reply With Quote
Old 01-17-2011, 08:10 PM   #3
lolife99
Old Member
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,415
"Drum to Disc" conversions 63-66*

DRUM TO DISC CONVERSIONS 63-66

63-66 truck with:

63-66 Crossmember Installed:
1) There are many advantage to leaving your 63-66 crossmember in place to add disc brakes.

2) 63-66 truck owners can now purchase "year specific" standard and drop spindles, from many aftermarket suspension vendors.
* No need to change ball joints.
* No need to change tie rod ends.
* These new "conversion disc brake spindles" are a true "bolt-on" mod to add disc brakes to your truck.

3) The 63-66 a-arms can also be used with any other spindle (71-72 or 73-87) with a simple ball joint change.
* The upper and lower ball joints and outer tie rods must match the correct year of spindle you choose.

4) You will need a "conversion" rubber brake hose to connect your disc brake caliper to your existing steel brake line.

5) Keeping your original 63-66 crossmember allows to to leave the engine and transmission in place.
* No need to remove drivetrain.
* No need to temporarily support the engine, while removeing the crossmember.
* Complete disassembly of the front suspension also allows you the ability to clean, inspect, replace or rebuild all the individual components.


Links:
*http://www.classicperform.com/discdrop.htm
*http://www.earlyclassic.com/Tech.asp...20That%20Truck
*http://www.customclassictrucks.com/t...all/index.html

*********************************************************
*********************************************************

63-66 truck with:

71-72 Crossmember Installed:
1) Your truck's donor 71-72 crossmember came from the factory with disc brakes.

2) "Year Specific" 71-72 drop spindles are readily available.

3) All 71-72 oem and drop spindles only work with HD rotors.
* All 71-72 rotors are the HD version (1-1/4" wide).
* The HD rotors will require matching HD calipers.

4) 71-72 steering linkage contains 11/16" diameter tie rods.
* Inner Tie rods are LH thread.
* Outer Tie rods are RH thread.
* Inner Tie Rods are a "2-year only" tie rods. (71-72 only)
* Outer Tie Rods are a "2-year only" tie rods. (71-72 only)

5) Steering Linkage:
* All 71-72 oem linkage will work with 71-72 "year specific" oem and drop spindles.

6) A-arms have steel bushings.

7) 71-72 crossmembers have the steel brake line connect the rubber brake hose on the front side of the crossmember.
* Steel reproduction brake line sets are specific to the 71-72 design.

8) Rubber brake hoses are a "2-year only" item. (71-72)

9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels on your 60-62 truck.
* Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion.
* You will need to use a set of steel wheels found on the later 73-87 4x4 trucks.

*********************************************************
*********************************************************

63-66 truck with:

71-72 Crossmember Not Yet Installed:
1) Your truck's donor 71-72 crossmember came from the factory with disc brakes.
* You can swap out the entire 63-70 crossmember in one unit.
* Only a few holes will need to be drilled or elongated.
* The best option is to use all of the 71-72 steering components.
(centerlink, tie rods, idler arm, steering box and pitman arm)

2) 63-66 steering linkage use a different centerlink and tie rods, than the 71-72 crossmember you will be installing.

3) 63-66 tie rods are 5/8" diameter,... 71-72 tie rods are 11/16" diameter (with the opposite thread direction).
* 63-66 inner tie rods are RH thread vs. 71-72 inner tie rods (that are LH thread).
* 63-66 outer tie rods are LH thread vs 71-72 outer tie rods (that are RH thread).
* Again,... It's easiest to just use all of the 71-72 steering linkage.
* You can also use all of the 73-87 steering linkage, but you will have to change the outer tie rods to the 71-72 version to match the 71-72 spindle.

4) If you must use your 63-66 centerlink and inner tie rods:
* You will be require to use a "conversion" tie rod sleeve to connect the 63-66 5/8" diameter tie rod,... to the 71-72 11/16" diameter outer tie rod.
* Here is the problem: The 63-66 inner tie rod is RH thread. The 71-72 outer tie rod is also RH thread.
* To correct this,... you must use a 63-66 outer tie rod in the inner location.
* (The 63-66 outer tie rod is LH thread)

5) If you just want to add 71-72 spindles to your existing 63-66 a-arms,... you will need to change the 63-66 upper and lower ball joint to 71-72 upper and lower ball joints.
* The outer tie rod will have to be a 71-72 outer tie rod also. (see Step #4 above)

6) Rubber brake hoses:
* You must change to a disc brake style hose.
* Early Classic Enterprises, and other suspension vendors, make a "conversion" brake hose that will connect the disc brake caliper, to the original 63-66 brake hose steel line location.
* 71-72 hoses is another option. (but I haven't personally confirmed if the steel line connection is the correct size).
* Another option is to use 73-87 hoses, (cheaper to purchase), but they are much longer, and also may need fitting adapters.
* Aftermarket steel braided hoses and AN fittings is another option.

7) You can also just swap all the components from the a-arms out and leave your original 63-66 crossmember in place.
* This will require you to completly disassemble both the original 63-66 suspension and the 71-72 donor suspension.
* This is also a good time to clean, inspect, replace or rebuild any needed components.


Links:
*http://67-72chevytrucks.com/vboard/s...+brake+install.
* Hotchkis Suspension:
http://www.truckinweb.com/tech/suspe...dup/index.html

*********************************************************
*********************************************************

63-66 truck with:

73-87 Crossmember Installed:
1) Your trucks 73-87 donor crossmember came from the factory with disc brakes.
* Using the 73-87 crossmember allows for upgrading to 73-87 style rubber bushed a-arms.
* Most replacement parts are more affordable than the "2-year" specific 71-72 model trucks.
* Plus most auto parts stores keep these parts in stock.

2) Drop spindles are readily available,... but there are two versions that must match the two rotor versions below:

3) Rotors: There are two different widths of rotors available on the 73-87 model trucks.
3.1) HD or Heavy Duty rotors: (1-1/4" wide version) available from 73-87
* These will require matching HD bearings and calipers.
3.2) LD or Light Duty rotors: (1" wide version) available from 81-87.
* These will require matching LD bearings and calipers.

4) Steering linkage contains 11/16" diameter tie rods.
* Inner Tie rods are LH thread.
* Outer Tie rods are RH thread.
* Inner Tie Rods are 73-87 specific
* Outer Tie Rods are 73-87 specific

5) All 73-87 oem steering linkage will work with your 73-87 spindles.

6) The 1/2 ton a-arms have rubber bushed cross shafts
* (compared to the steel bushings of the 71-72 a-arms)

7) 73-87 crossmembers have the steel brake lines, connect the rubber brake hose, through a hole originally drilled in the 73-87 frame rail.
* Using these crossmembers in the older trucks will require you to fabricate some or all of your steel brake lines.
* (63-66 brake lines connect on the rear side of the crossmember)
* (71-72 brake lines connect on the front side of the crossmember)
* Steel reproduction brake line sets are specific to the 73-87 design with their proportioning valve mounted on a crossmember in front of the engine opposed to hanging below the master cylinder.

8) 73-87 rubber brake hoses are much longer than either the 63-66 drum brake hose or the 71-72 disc brake hose.

9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels.
* To use the 6-lug rotors you must have the 73-87 HD spindles,... since all aftermarket 6-lug rotors are only available in the 1-1/4" wide version.
* Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion.
* You will need to use a set of steel wheels found on the later 73-87 4x4 trucks.

*********************************************************
*********************************************************

63-66 truck with:

73-87 Crossmember Not Yet Installed:
1) This swap is almost a direct bolt in, with just a few holes to drill/elongate.

2) The preferred method is to use all of the 73-87 steering linkage:
* This includes the centerlink, inner and outer tie rods, idler arm and steering box. (A great way to gain P/S)

3) If you must use the 63-66 steering components, you will need to change the tie rods:
* The 63-66 inner and outer tie rods are a smaller diameter (5/8") vs. the 73-87 tie rods larger diameter (11/16").
* The 63-66 tie rods are also the opposite thread direction of the 73-87 tie rods.
* 63-66 inner is RH thread vs. 73-87 inner which is LH thread.
* 63-66 outer is LH thread vs. 73-87 outer which is RH thread.

3.1) So to connect the 73-87 spindle to the 63-66 steering centerlink you must use a:
* 63-66 outer tie rod (LH thread) in the inner location.
* connect that to a tie rod "conversion sleeve". (these are sold by many aftermarket suspension companies).
* use a 73-87 outer (RH thread) to connect to your 73-87 spindle.
* Again,... it's much simpler to use all of the 73-87 steering components.

4) Connecting the 73-87 rubber brake lines to the 63-66 steel lines, may require steel line fabrication, or brass "inverted flare" adapters.

5) You can also just swap all the components, from the a-arms out,... and leave your original 63-66 crossmember in place.
* This will require you to completly disassemble both the original 63-66 suspension and the 73-87 donor suspension.
* This is also a good time to clean, inspect, replace or rebuild any needed components.


Links:
*http://67-72chevytrucks.com/vboard/s...+brake+install
*http://www.67-72chevytrucks.com/vboa...d.php?t=357610

*http://www.classictrucks.com/tech/05...ing/index.html

CPP Modular Spindle Install
*http://www.classicperform.com/tech_a....05.09-web.pdf

*16" WILWOOD Install:http://www.customclassictrucks.com/t...10s/index.html

*********************************************************
*********************************************************

63-66 Truck With 6-lug Disc Brakes:

6-Lug Drum to 6-Lug Disc Conversions:
1) This 6-lug disc brake swap will include all of the above 5-lug information.

2) The only difference is the use of an aftermarket 6-lug rotor.
* These rotors are new castings.
* These rotors have been drilled with the correct 6x5.5" 6-lug pattern.
* These rotors have the correct 7/16" lug studs that match the original drum brake lug studs.

3) Several aftermarket suspension vendors sell these rotors,... such as:
* ECE (Early Classic Enterprises).
* POL (Performance OnLine).
* CPP (Classic Performance Products).

4) All 63-66 "conversion" stock height and drop spindles will work with these 6-lug rotors.

5) All 71-72 stock oem and drop spindles will work with these 6-lug rotors.

6) If using a 73-87 spindle,... it must be the HD spindle, that works with the 1-1/4" wide rotors.
* The 81-87 LD spindles will not work with these 6-lug rotors.

Links:
*http://www.earlyclassic.com/tech.asp...arly%20Braking
*http://www.earlyclassic.com/tech.asp...h%20And%20Whoa

6-lug Rotors:
*http://67-72chevytrucks.com/vboard/s...ght=Disc+Brake
__________________
Keith
Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
WTB: Radio Delete Plates and clips.
lolife99 is offline   Reply With Quote
Old 01-17-2011, 08:10 PM   #4
lolife99
Old Member
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,415
"Drum to Disc" conversions 67-70

DRUM TO DISC CONVERSIONS 67-70

67-70 truck with

67-70 Crossmember Installed:
1) There are many advantage to leaving your 67-70 crossmember in place to add disc brakes.

2) 67-70 truck owners can now purchase "year specific" standard and drop spindles, from many aftermarket suspension vendors.
* No need to change ball joints.
* No need to change tie rod ends.
* These new "conversion disc brake spindles" are a true "bolt-on" mod to add disc brakes to your truck.

3) The 67-70 a-arms can also be used with any other (71-72 or 73-87) spindle, with a simple ball joint change.
* The upper and lower ball joints and outer tie rods must match the correct year of spindle you choose.

4) You will need a "conversion" rubber brake hose to connect your disc brake caliper to your existing steel brake line.
* 71-72 rubber brake hoses can be adapted.
* Much longer 73-87 brake hoses can also be adapted.
* Aftermarket steel braided brake hoses are an option.

5) Keeping your original 67-70 crossmember allows to to leave the engine and transmission in place.
* No need to remove drivetrain.
* No need to temporarily support the engine, while removing the crossmember.
* Complete disassembly of the front suspension also allows you the ability to clean, inspect, replace or rebuild all the individual components.


Links:
*http://www.classicperform.com/discdrop.htm
*http://www.earlyclassic.com/Tech.asp...20That%20Truck
*http://www.customclassictrucks.com/t...all/index.html

*********************************************************
*********************************************************

67-70 truck with

71-72 Crossmember Installed:
1) Your truck's donor 71-72 crossmember came from the factory with disc brakes.

2) "Year Specific" 71-72 drop spindles are readily available.

3) All 71-72 oem and drop spindles only work with HD rotors.
* All 71-72 rotors are the HD version (1-1/4" wide).
* The HD rotors will require matching HD calipers and wheel bearings.

4) 71-72 steering linkage contains 11/16" diameter tie rods.
* Inner Tie rods are LH thread.
* Outer Tie rods are RH thread.
* Inner Tie Rods are a "2-year only" tie rods. (71-72 only)
* Outer Tie Rods are a "2-year only" tie rods. (71-72 only)

5) Steering Linkage:
* All 71-72 oem linkage will work with 71-72 "year specific" oem and drop spindles.

6) A-arms have steel bushings.

7) 71-72 crossmembers have the steel brake line connect the rubber brake hose on the front side of the crossmember.
* Steel reproduction brake line sets are specific to the 71-72 design.

8) Rubber brake hoses are a "2-year only" item. (71-72)

9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels on your 60-62 truck.
* Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion.
* You will need to use a set of steel wheels found on the later 73-87 4x4 trucks.

*********************************************************
*********************************************************

67-70 truck with

73-87 Crossmember Installed:
1) Your trucks 73-87 donor crossmember came from the factory with disc brakes.
* Using the 73-87 crossmember allows for upgrading to 73-87 style rubber bushed a-arms.
* Most replacement parts are more affordable than the "2-year" specific 71-72 model trucks.
* Most auto parts stores keep these parts "in stock".

2) Drop spindles are readily available,... but there are two versions that must match the two rotor versions below:

3) Rotors:
* There are two different widths of rotors available on the 73-87 model trucks.
3.1) HD or Heavy Duty rotors: (1-1/4" wide version) available from 73-87
* These will require matching HD bearings and calipers.
3.2) LD or Light Duty rotors: (1" wide version) available from 81-87.
* These will require matching LD bearings and calipers.

4) Steering linkage contains 11/16" diameter tie rods.
* Inner Tie rods are LH thread.
* Outer Tie rods are RH thread.
* Inner Tie Rods are 73-87 specific
* Outer Tie Rods are 73-87 specific

5) All 73-87 oem steering linkage will work with your 73-87 spindles.

6) The 1/2 ton a-arms have rubber bushed cross shafts
* (compared to the steel bushings of the 71-72 a-arms)

7) 73-87 crossmembers have the steel brake lines, connect the rubber brake hose, through a hole originally drilled in the 73-87 frame rail.
* Using these crossmembers in the older trucks will require you to fabricate some or all of your steel brake lines.
* (67-70 brake lines connect on the rear side of the crossmember)
* (71-72 brake lines connect on the front side of the crossmember)
* Steel reproduction brake line sets are specific to the 73-87 design with their proportioning valve mounted on a crossmember in front of the engine opposed to hanging below the master cylinder.

8) 73-87 rubber brake hoses are much longer than either the 63-70 drum brake hose or the 71-72 disc brake hose.

9) 6-lug aftermarket rotors are now readily available if you decide you want to keep your 6-lug style wheels.
* To use the 6-lug rotors you must have the 73-87 HD spindles,... since all aftermarket 6-lug rotors are only available in the 1-1/4" wide version.
* Be aware that the oem 15x6.5 steel 6-lug wheels will not clear your new disc brake conversion.
* You will need to use a set of steel wheels found on the later 73-87 4x4 trucks.

*********************************************************
*********************************************************

67-70 truck with

71-72 Crossmember Not Yet Installed:
1) Your truck's donor 71-72 crossmember came from the factory with disc brakes.
* You can swap out the entire 67-70 crossmember in one unit.
* Only a few holes will need to be drilled or elongated.
* The best option is to use all of the 71-72 steering components.
(centerlink, tie rods, idler arm, steering box and pitman arm)

2) 67-70 steering linkage use a different centerlink and tie rods, than the 71-72 crossmember you will be installing.

3) 67-70 tie rods are 5/8" diameter,... 71-72 tie rods are 11/16" diameter (with the opposite thread direction).
* 67-70 inner tie rods are RH thread vs. 71-72 inner tie rods (that are LH thread).
* 67-70 outer tie rods are LH thread vs 71-72 outer tie rods (that are RH thread).
* Again,... It's easiest to just use all of the 71-72 steering linkage.
* You can also use all of the 73-87 steering linkage, but you will have to change the outer tie rods to the 71-72 version to match the 71-72 spindle.

4) If you must use your 67-70 centerlink and inner tie rods:
* You will be require to use a "conversion" tie rod sleeve to connect the 67-70 5/8" diameter tie rod,... to the 71-72 11/16" diameter outer tie rod.
* Here is the problem: The 67-70 inner tie rod is RH thread. The 71-72 outer tie rod is also RH thread.
* To correct this,... you must use a 63-70 outer tie rod in the inner location.
* (The 67-70 outer tie rod is LH thread)

5) If you just want to add 71-72 spindles to your existing 67-70 a-arms,... you will need to change the 67-70 upper and lower ball joint to 71-72 upper and lower ball joints.
* The outer tie rod will have to be a 71-72 outer tie rod also. (see Step #4 above)

6) Rubber brake hoses:
* You must change to a disc brake style hose.
* Early Classic Enterprises, and other suspension vendors, make a "conversion" brake hose that will connect the disc brake caliper, to the original 67-70 brake hose steel line location.
* 71-72 hoses is another option. (but I haven't personally confirmed if the steel line connection is the correct size).
* Another option is to use 73-87 hoses, (cheaper to purchase), but they are much longer, and also may need fitting adapters.
* Aftermarket steel braided hoses and AN fittings is another option.

7) You can also just swap all the components from the a-arms out and leave your original 67-70 crossmember in place.
* This will require you to completly disassemble both the original 67-70 suspension and the 71-72 donor suspension.
* This is also a good time to clean, inspect, replace or rebuild any needed components.


Links:
*http://67-72chevytrucks.com/vboard/s...+brake+install.
* Hotchkis Suspension:
http://www.truckinweb.com/tech/suspe...dup/index.html

*********************************************************
*********************************************************

67-70 truck with

73-87 Crossmember Not Yet Installed:
1) Your donor 73-87 crossmember came from the factory with disc brakes.
* This swap is almost a direct bolt in, with just a few holes to drill/elongate.

2) The preferred method is to use all of the 73-87 steering linkage:
* This includes the centerlink, inner and outer tie rods, idler arm and steering box. (A great way to gain P/S)

3) If you must use the 67-70 steering components, you will need to change the tie rods:
* The 67-70 inner and outer tie rods are a smaller diameter (5/8") vs. the 73-87 tie rods larger diameter (11/16").
* The 67-70 tie rods are also the opposite thread direction of the 73-87 tie rods.
* 67-70 inner is RH thread vs. 73-87 inner which is LH thread.
* 67-70 outer is LH thread vs. 73-87 outer which is RH thread.

3.1) So to connect the 73-87 spindle to the 67-70 steering centerlink you must use a:
* 67-70 outer tie rod (LH thread) in the inner location.
* connect that to a tie rod "conversion sleeve". (these are sold by many aftermarket suspension companies).
* use a 73-87 outer (RH thread) to connect to your 73-87 spindle.
* Again,... it's much simpler to use all of the 73-87 steering components.

4) Connecting the 73-87 rubber brake lines to the 67-70 steel lines, may require steel line fabrication, or brass "inverted flare" adapters.

5) You can also just swap all the components, from the a-arms out,... and leave your original 67-70 crossmember in place.
* This will require you to completly disassemble both the original 67-70 suspension and the 73-87 donor suspension.
* This is also a good time to clean, inspect, replace or rebuild any needed components.


Links:
*http://67-72chevytrucks.com/vboard/s...+brake+install
*http://www.67-72chevytrucks.com/vboa...d.php?t=357610

*http://www.classictrucks.com/tech/05...ing/index.html

CPP Modular Spindle Install
*http://www.classicperform.com/tech_a....05.09-web.pdf

*16" WILWOOD Install:http://www.customclassictrucks.com/t...10s/index.html


*********************************************************
*********************************************************

67-70 Truck With 6-lug Disc Brakes:

6-Lug Drum to 6-Lug Disc Conversions:
1) This 6-lug disc brake swap will include all of the above 5-lug information.

2) The only difference is the use of an aftermarket 6-lug rotor.
* These rotors are new castings.
* These rotors have been drilled with the correct 6x5.5" 6-lug pattern.
* These rotors have the correct 7/16" lug studs that match the original drum brake lug studs.

3) Several aftermarket suspension vendors sell these rotors,... such as:
* ECE (Early Classic Enterprises).
* POL (Performance OnLine).
* CPP (Classic Performance Products).

4) All 63-70 "conversion" stock height and drop spindles will work with these 6-lug rotors.

5) All 71-72 stock oem and drop spindles will work with these 6-lug rotors.

6) If using a 73-87 spindle,... it must be the HD spindle, that works with the 1-1/4" wide rotors.
* The 81-87 LD spindles will not work with these 6-lug rotors.

Links:
*http://www.earlyclassic.com/tech.asp...arly%20Braking
*http://www.earlyclassic.com/tech.asp...h%20And%20Whoa
* http://www.classictrucks.com/tech/05...all/index.html

6-lug Rotors:
*http://67-72chevytrucks.com/vboard/s...ght=Disc+Brake

*********************************************************
*********************************************************

60-72 truck with

"Unknown" Crossmember Swap?
* This is where it's hard to determine the correct parts needed.

Here's the break down by year:

Disc Brake Spindle:
*60-70 (Aftermarket Conversion Spindles)
*71-72 (oem or drop)
*73-87 (oem or drop)

C10
Grouped by Differences:
*60-62
*63-70
*71-72
*73-87 (HD 1.25" wide rotors)
*81-87 (LD 1.00" wide rotors)
**Some 81-87 trucks also had the HD rotors**
** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version**
C20
*71-87

Rotors:
*71-72 (1.25" wide)
*73-87 (HD 1.25" wide rotors)
*81-87 (LD 1.00" wide rotors)
**Some 81-87 trucks also had the HD rotors**
** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version**

Calipers:
*71-72 (1.25" wide)
*73-87 (HD 1.25" wide rotors)
*81-87 (LD 1.00" wide rotors)
**Some 81-87 trucks also had the HD rotors**
** All Aftermarket 6-lug "Conversion Rotors Are the HD 1.25" wide version**

Upper Ball Joint:
Grouped by Differences:
C10
*60-62
*63-70
*71-72
*73-87
C20
*71-87

Lower Ball Joint:
Grouped by Differences:
C10
*60-62
*63-70
*71-87
C20
*71-87

Control Arm Upper Cross Shafts:
Grouped by Differences:
C10
*60-62
*63-72
*73-87
C20
*63-87

Control Arm Lower Cross Shafts:
Grouped by Differences:
C10
*60-62
*63-72
*73-87
C20
*67-86


Inner Tie Rods:
Grouped by Differences:
C10
*60-62
*63-64
*65-70
*71-72
*73-87
C20
*60-64 (drivers side)
*60-64 (pass. side)
*65-70
*71-87

Outer Tie Rods:
Grouped by Differences:
C10
*60-64
*65-70
*71-72
*73-87
C20
*60-64
*65-70
*71-87

Tie Rod Adjusting Sleeves
Grouped by Differences:
C10 and C20
*60-64
*65-70 (5/8" thread)
*71-87 (11/16" thread)

Centerlink:
Grouped by Differences:
*60-62
*63-64
*65-70
*71-72
*73-87

Pitman Arm:
Grouped by differences:
C10
*60-66 Manual
*60-66 P/S
*67-72 Manual
*67-87 P/S (Specify Year When Ordering)
C20
manual:
*60-66
*67-68
*69-70
*71-87
Power Steering:
*69-70
*71-87

Idler Arm
Grouped by differences:
C10
*60-62
*63-66
*67-82
*83-87
C20
*60-66
*67-82
*83-87

Steering Box:
Manual
*60-62
*63-66
*67-87
Power Steering
__________________
Keith
Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
WTB: Radio Delete Plates and clips.

Last edited by lolife99; 01-20-2013 at 09:58 AM.
lolife99 is offline   Reply With Quote
Old 07-29-2018, 06:08 PM   #5
tuff enuff
Registered User
 
Join Date: May 2018
Location: Fayetteville ga.
Posts: 14
Re: "Drum to Disc" Conversion FAQ 60-70

I have a 66 c10 that the PO did a disc brake conversion on, I'm wanting to install drop spindles, all the drop spindles i have seen say must use with 71-72 disc brakes or EQUIVALENT . Is the disc brake kit on my truck EQUIVALENT? the rotors are 1 1/4 thick ... I don't know if i am reading this right ,are the disc brake conversion kit for a 66 c10 the same as the 71-72??? I just need to know if ill be alright purchasing drop spindles that require 71-72 disc brakes, will they fit my 66 disc brake conversion? THANKS
tuff enuff is offline   Reply With Quote
Old 07-30-2018, 10:28 AM   #6
lolife99
Old Member
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,415
Re: "Drum to Disc" Conversion FAQ 60-70

Your concern should be what year ball joints and outer tie rods your kit uses.
That’s a must know item when buying spindles. They have to match.
1-1/4” rotors were used in 71-72 trucks.
Most every conversion kit uses 1-1/4” rotors.
Some 73-87 trucks used 1-1/4” rotors.
Some 81-87 trucks used the light duty 1” rotors.
__________________
Keith
Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
WTB: Radio Delete Plates and clips.
lolife99 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:19 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com