71 front disk brake axle in a 70 K10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pwdcougar · 04-03-2021, 09:23 PM

A while back I posted about upgrading my 70 K10 to power disks instead of drums. I've found someone who has a 71 K10 disk brake axle for sale localish for $250. Is it a worthwhile swap? I've got to determine the axle ratio and if the 71 axle is junk or not.

Paul

70' · 04-03-2021, 10:40 PM

Its worth it, atleast that's my opinion. That would be a direct bolt up. You would need to swap out your front brake lines, and your master cylinder to complete the swap.

**IronCanine** · 04-03-2021, 11:31 PM

100%. Do it....you'll be glad you did. Did the same to our '69. '71 was our donor too. Yes to break lines...prop valve too. And as you said, gears gotta match. But otherwise, an easy direct bolt up.

**kwmech** · 04-04-2021, 01:20 AM

1970 is already open knuckle, so if push comes to shove with the gear ratio, you can swap the knuckles out

**1970cstblazer** · 04-04-2021, 11:23 AM

From the Blazer section:

Quote:

Originally Posted by ohboy321

The only parts that will bolt in on a 70 D44 would be from a 71. They increased the axle and u-joint size starting in 72.

Duckduckgo the BOM (bill of materials) for the D44 and you can see the axle part numbers are different between 71 to 72, while 70 to 71 are the same. Sorry I don't have a link for the BOM, but the info is out there.

My K10 has a 70 Blazer D44 front axle, and I hope to convert to disk some day.

pwdcougar · 04-04-2021, 01:59 PM

Thanks guys!

Now the seller isn't sure what year the axle is from!

Any links to how to identify the different years?

Paul

pwdcougar · 04-04-2021, 02:03 PM

Quote:

Originally Posted by pwdcougar

Thanks guys!

Now the seller isn't sure what year the axle is from!

Any links to how to identify the different years?

Paul

This is the pic he sent.

57taskforce · 04-04-2021, 02:41 PM

If bet that is a 73+ setup based on the stabilizer mounting, it really doesn’t matter though it will bolt up just the same.

**dozerbill72** · 04-04-2021, 07:09 PM

Even if the ring and pinion are junk or a different ratio than yours it's still the cheapest way to get disks. You can use the knuckles, spindles and rotors off the donor axle and swap onto yours.

**IronCanine** · 04-04-2021, 07:42 PM

Also...if all else is good, but the ratio doesn't match, you could swap out your existing gear set into this axle.

**Jiggers72-GMC** · 04-05-2021, 09:16 AM

Great info guys, while we're talking about 1971 4x4 with disc brakes, who sells the dust shields for a 4x4 axle, thank you

57taskforce · 04-05-2021, 04:43 PM

Quote:

Originally Posted by Jiggers72-GMC

Great info guys, while we're talking about 1971 4x4 with disc brakes, who sells the dust shields for a 4x4 axle, thank you

It seems those may have become hard to find. My dad had to repair the dust shields on his K20 last year because he couldn’t find new ones anywhere, online or even Napa.

gmc684x4 · 04-05-2021, 05:33 PM

Lmc should have k10 dust sheilds
Any pic a parts locally to you ?
The nice k10 dust sheilds are steel

I agree with 57taskforce i think its a 73 up diff it will still bolt in place thought it may need one shock mount relocated i seem to think 73 up front diffs have one shock in front and one in back of the diff

57taskforce · 04-05-2021, 06:15 PM

Quote:

Originally Posted by gmc684x4

Lmc should have k10 dust sheilds
Any pic a parts locally to you ?
The nice k10 dust sheilds are steel

I agree with 57taskforce i think its a 73 up diff it will still bolt in place thought it may need one shock mount relocated i seem to think 73 up front diffs have one shock in front and one in back of the diff

The rears are like that, the front axles are not. Both shocks mount to the rear on the 73+ fronts just like 67-72.

**Jiggers72-GMC** · 04-05-2021, 08:34 PM

Great info on the brake dust shields guys, I'll check the local pick-a-part as well ....... I didn't think of that, rust is a huge problem up here.

k29349 · 04-05-2021, 08:46 PM

You can even use the later model 10 bolts if you want. I think the 88 -91s have 30 spline axles on the 10 bolts. Earlier 10 bolts have 28. I'm pretty sure the later dana 44s use axle shafts with bigger u-joints. 10 bolts are easier to swap gears in also. If you want Dana, I would look for a late 70s model.

**IronCanine** · 04-05-2021, 08:55 PM

Later model dust shields will work as well. You might try Torque King...they may have some in stock. 71-72 had the two piece welded (caliper bracket + dust shield) and later versions were the one piece stamped version. Here are pics of both.

**Jiggers72-GMC** · 04-05-2021, 09:08 PM

IronCanine perfect info man, thanks so much for the pics.

**kwmech** · 04-05-2021, 10:16 PM

In the pic he sent you there is a chance that it could be a 10 bolt looking at the plate across the shock mount

gmc684x4 · 04-06-2021, 06:03 PM

I have not looked at the 77 blazer set in the back 40 since I cut them out 7 years back
Thanks 57 for clearing that up been thinking of using them in my 72 for a quick 3.73 gear change not sure how I will like the 3.07 gears in my dads truck 4x4ing

**davischevy** · 04-06-2021, 10:56 PM

https://torqueking.com/product/55302...974-1979-jeep/

04-03-2021, 09:23 PM	#1
pwdcougar Registered User Join Date: Oct 2013 Location: New Jersey Posts: 1,302	71 front disk brake axle in a 70 K10 A while back I posted about upgrading my 70 K10 to power disks instead of drums. I've found someone who has a 71 K10 disk brake axle for sale localish for $250. Is it a worthwhile swap? I've got to determine the axle ratio and if the 71 axle is junk or not. Paul __________________ "You know that little thing in your head that keeps you from saying things you shouldn't? Yeah well, I don't have one of those" 1969 Mercury Cougar Standard 4 speed 1969 Mercury Cougar XR7 convertible 1970 4WD Chevrolet Suburban 1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)

04-03-2021, 10:40 PM	#2
70' Registered User Join Date: Nov 2014 Location: Dickinson, ND Posts: 197	Re: 71 front disk brake axle in a 70 K10 Its worth it, atleast that's my opinion. That would be a direct bolt up. You would need to swap out your front brake lines, and your master cylinder to complete the swap.

04-03-2021, 11:31 PM	#3
IronCanine I'm trying.... Join Date: Oct 2013 Location: Athens, GA Posts: 2,535	Re: 71 front disk brake axle in a 70 K10 100%. Do it....you'll be glad you did. Did the same to our '69. '71 was our donor too. Yes to break lines...prop valve too. And as you said, gears gotta match. But otherwise, an easy direct bolt up. Attached Images __________________ 1970 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=645076 1969 K10 SWB CST http://67-72chevytrucks.com/vboard/s...52#post8520352 1971 K20 Z84 https://67-72chevytrucks.com/vboard/...90#post9047290 1946 B.F. Avery Model A Tractor http://67-72chevytrucks.com/vboard/s...55#post8292555 "Sometimes I wonder if zander208 was even real..."

04-04-2021, 01:20 AM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,389	Re: 71 front disk brake axle in a 70 K10 1970 is already open knuckle, so if push comes to shove with the gear ratio, you can swap the knuckles out

04-04-2021, 01:59 PM	#6
pwdcougar Registered User Join Date: Oct 2013 Location: New Jersey Posts: 1,302	Re: 71 front disk brake axle in a 70 K10 Thanks guys! Now the seller isn't sure what year the axle is from! Any links to how to identify the different years? Paul __________________ "You know that little thing in your head that keeps you from saying things you shouldn't? Yeah well, I don't have one of those" 1969 Mercury Cougar Standard 4 speed 1969 Mercury Cougar XR7 convertible 1970 4WD Chevrolet Suburban 1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)

04-04-2021, 02:41 PM	#8
57taskforce All about them K’s Join Date: Jun 2014 Location: Farmington, New Mexico Posts: 6,229	Re: 71 front disk brake axle in a 70 K10 If bet that is a 73+ setup based on the stabilizer mounting, it really doesn’t matter though it will bolt up just the same. __________________ Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0

04-04-2021, 07:09 PM	#9
dozerbill72 Senior Member Join Date: Oct 2015 Location: Berryville Arkansas Posts: 402	Re: 71 front disk brake axle in a 70 K10 Even if the ring and pinion are junk or a different ratio than yours it's still the cheapest way to get disks. You can use the knuckles, spindles and rotors off the donor axle and swap onto yours.

04-04-2021, 07:42 PM	#10
IronCanine I'm trying.... Join Date: Oct 2013 Location: Athens, GA Posts: 2,535	Re: 71 front disk brake axle in a 70 K10 Also...if all else is good, but the ratio doesn't match, you could swap out your existing gear set into this axle. __________________ 1970 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=645076 1969 K10 SWB CST http://67-72chevytrucks.com/vboard/s...52#post8520352 1971 K20 Z84 https://67-72chevytrucks.com/vboard/...90#post9047290 1946 B.F. Avery Model A Tractor http://67-72chevytrucks.com/vboard/s...55#post8292555 "Sometimes I wonder if zander208 was even real..."

04-05-2021, 09:16 AM	#11
Jiggers72-GMC Senior Member Join Date: Mar 2021 Location: up North Posts: 541	Re: 71 front disk brake axle in a 70 K10 Great info guys, while we're talking about 1971 4x4 with disc brakes, who sells the dust shields for a 4x4 axle, thank you

04-05-2021, 05:33 PM	#13
gmc684x4 Registered User Join Date: Jul 2012 Location: Whitehorse yukon Posts: 1,218	Re: 71 front disk brake axle in a 70 K10 Lmc should have k10 dust sheilds Any pic a parts locally to you ? The nice k10 dust sheilds are steel I agree with 57taskforce i think its a 73 up diff it will still bolt in place thought it may need one shock mount relocated i seem to think 73 up front diffs have one shock in front and one in back of the diff

04-05-2021, 08:34 PM	#15
Jiggers72-GMC Senior Member Join Date: Mar 2021 Location: up North Posts: 541	Re: 71 front disk brake axle in a 70 K10 Great info on the brake dust shields guys, I'll check the local pick-a-part as well ....... I didn't think of that, rust is a huge problem up here. __________________ Gerry, North Bay Ontario 1971 Chevy K10 short stepper, 518 med green & white 1972 GMC C1500 long box, dark Brown, owned since 1977 1969 GMC C2500 manual

04-05-2021, 08:46 PM	#16
k29349 Registered User Join Date: Nov 2013 Location: Inman S.C. Posts: 67	Re: 71 front disk brake axle in a 70 K10 You can even use the later model 10 bolts if you want. I think the 88 -91s have 30 spline axles on the 10 bolts. Earlier 10 bolts have 28. I'm pretty sure the later dana 44s use axle shafts with bigger u-joints. 10 bolts are easier to swap gears in also. If you want Dana, I would look for a late 70s model.

04-05-2021, 08:55 PM	#17
IronCanine I'm trying.... Join Date: Oct 2013 Location: Athens, GA Posts: 2,535	Re: 71 front disk brake axle in a 70 K10 Later model dust shields will work as well. You might try Torque King...they may have some in stock. 71-72 had the two piece welded (caliper bracket + dust shield) and later versions were the one piece stamped version. Here are pics of both. Attached Images __________________ 1970 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=645076 1969 K10 SWB CST http://67-72chevytrucks.com/vboard/s...52#post8520352 1971 K20 Z84 https://67-72chevytrucks.com/vboard/...90#post9047290 1946 B.F. Avery Model A Tractor http://67-72chevytrucks.com/vboard/s...55#post8292555 "Sometimes I wonder if zander208 was even real..."

04-05-2021, 09:08 PM	#18
Jiggers72-GMC Senior Member Join Date: Mar 2021 Location: up North Posts: 541	Re: 71 front disk brake axle in a 70 K10 IronCanine perfect info man, thanks so much for the pics. __________________ Gerry, North Bay Ontario 1971 Chevy K10 short stepper, 518 med green & white 1972 GMC C1500 long box, dark Brown, owned since 1977 1969 GMC C2500 manual

04-05-2021, 10:16 PM	#19
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,389	Re: 71 front disk brake axle in a 70 K10 In the pic he sent you there is a chance that it could be a 10 bolt looking at the plate across the shock mount



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04-06-2021, 06:03 PM	#20
gmc684x4 Registered User Join Date: Jul 2012 Location: Whitehorse yukon Posts: 1,218	Re: 71 front disk brake axle in a 70 K10 I have not looked at the 77 blazer set in the back 40 since I cut them out 7 years back Thanks 57 for clearing that up been thinking of using them in my 72 for a quick 3.73 gear change not sure how I will like the 3.07 gears in my dads truck 4x4ing

04-06-2021, 10:56 PM	#21
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,786	Re: 71 front disk brake axle in a 70 K10 https://torqueking.com/product/55302...974-1979-jeep/ __________________ 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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