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#76 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Dumb question but I have to ask.
How do I know what year the rear end is? I have no idea. This truck is pieced together from different years. Is there a mark on the rear end some where are does the numbers I posted give me my answer. It looks like they are all the same for our models. Mine having the load bolt helps. What parts manual do I need to look for? Thanks for all the info so far. ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#77 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,295
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Re: Eaton HO72 rear axle
Look here for axle ID information: http://67-72chevytrucks.com/vboard/s...d.php?t=590959
The parts are out there. It just takes some sleuthing but that keeps things fun - like hunting. Here’s the manual I’ve made use of:
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
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#78 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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$200.00 for a manual! I guess I need to do some searching.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#79 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,295
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Re: Eaton HO72 rear axle
How about a free electronic version then? Buy Ron a beer sometime
![]() Link: http://67-72chevytrucks.com/vboard/s...d.php?t=817560
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
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#80 |
72 BB C30 Super LongHorn
![]() Join Date: Nov 2002
Location: Chavez Ravine
Posts: 1,606
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Re: Eaton HO72 rear axle
Andy4639 :
PM sent
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72 BB C/30 Longhorn Super HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM HO72 build : http://67-72chevytrucks.com/vboard/s...d.php?t=714492 2017 SS ![]() |
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#81 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Thanks, I got it. Hope your doing better sir.
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#82 |
Senior Member
![]() ![]() Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,792
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Re: Eaton HO72 rear axle
Subscribed.
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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#83 | |
Registered User
Join Date: Nov 2019
Location: Eagle River Alaska
Posts: 320
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Re: HO72 rear axle
Quote:
I have the Eaton with 4.11 in my truck. Also 4inch lift and 35s . I also have the Gear vendors add on. Before the gear vendors I would be at 3500 rpm at 70mph. After the gear vendors install I am now at 2-2400 at 70mph. It was by far worth every penny. I understand why people would prefer the 14 bolt to the Eaton, but I love my Eaton. If I wasn't able to add the gear vendor kit I probably would have swapped. It was to loud at 3500 rpm when driving it for fishing trips. Also I drive my truck all across Alaska and the gear vendor kit has be amazing through all the elevations. |
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#84 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,295
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Re: Eaton HO72 rear axle
Adding this to document location of the locker tag (borrowed from Mike Cofield).
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
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#85 |
Registered User
Join Date: Jan 2020
Location: Meridian, ID
Posts: 28
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Re: Eaton HO72 rear axle
I have a c30 dually that I am keeping the HO72 axle as I like the way it looks, my question is for general driving, is the locker obnoxious and better to just keep an open diff? I am planning to move to 30 spline spiders/axle shaft. The cost between spiders vs locker isn’t that much.
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1972 C30 2WD 157” WB |
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#86 |
Registered User
Join Date: May 2016
Location: Oklahoma
Posts: 189
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Re: Eaton HO72 rear axle
The locker is awesome if you use your truck as a truck. Pretty much eliminates getting stuck. However, there are a few things that might bother some people:
1. When letting off throttle and reapplying, one wheel will be powered until the backlash is removed. This tends to make your truck dart to one side of the road. Not a scary amount, but something to be aware of. 2. When letting off the throttle, the locker will uncouple and send a "pop" vibration up the driveshaft. If you don't know what it is, you might think something is wrong in the drivetrain. 3. Quick acceleration around corners will almost always cause a chirp of one tire as there is no differential (one wheel has to turn faster than the other in a corner). 4. Because of #3, driving on snow or ice with highway tires could send you into a spin-out. All four are not enough for me to ever want to go back to an open diff. So much better with a locker. I hate getting stuck on a tiny mud puddle or wet grass.
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1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs |
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#87 | |
Registered User
Join Date: May 2016
Location: Oklahoma
Posts: 189
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Re: Eaton HO72 rear axle
Quote:
The star adjustment screw assemblies are compatible, as are the springs (one return spring has an extra bend but still works). You will also need the strut rod springs from a 14-bolt thru late model axle as these are not in the hardware kit. That strut spring stayed the same all the way up through the 2000's. Buy strut springs for a 2000 Chevy Express 3/4 ton and these will work fine.
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1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs |
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#88 | |
Registered User
Join Date: Jan 2020
Location: Meridian, ID
Posts: 28
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Re: Eaton HO72 rear axle
Quote:
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1972 C30 2WD 157” WB |
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