Eaton HO72 rear axle - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**57taskforce** · 02-02-2017, 10:47 AM

Quote:

Originally Posted by RPOZ11

Thanx
I'm still working on the chunk parts id'ing.
I'll be posting up the housing after I have it cleaned.
What's next is to reassemble the hubs with the new TimKen bearings.
Re-install it all to double check everything, then move into the brake system.
I'm working on brake systems.
Give me a few weeks here.
My work hopefully will shed some results

Nice progress!

**RPOZ11** · 02-11-2017, 04:28 PM

Axle housing, backing plates, inspection cover stripped.

Now at powder coating shop to be covered in black.

Tdrcreyn4 · 02-12-2017, 05:57 PM

subbed

**RPOZ11** · 02-18-2017, 05:33 PM

Ready to reassemble ...

B. W. · 02-18-2017, 06:49 PM

You may have already found this info. The tag denotes what type of differential, can't remember if it's gear ratio or locker/open/ limited slip. GM used different shaped tags with no data on them to differentiate differentials (yeah, that was a play on words)

**RPOZ11** · 02-18-2017, 07:12 PM

I do still have the tag from it.
No info present on it.
As suggested, the stamped code on the drop out defined its build.

We are currently in the process of sizing up all the bearings for fit.
Paint up the hubs then install the bearing races for it.
Waiting for the disc brake brackets to arrive so we can try that on this.
Still need to buy the calipers, rotors, brake lines, and rebuild the Ring & Pinion.
Going to try the 14-Bolt Locker & 14-Bolt axles.

Its all new for me.
My first attempt at doing a rear axle

**RPOZ11** · 02-25-2017, 06:28 PM

DIY 4X4 14-Bolt Disc Brake brackets
They fit! 😎

**BlueBullet** · 02-25-2017, 06:59 PM

Looking good thanks for providing all the information

**RPOZ11** · 02-25-2017, 07:42 PM

My pleasure!
I'm learning as I do it all.

Eaton Detroit Locker 225S-10 DL 14- bolt

Need a few weeks to disassemble the ring & pinion assembly, powder coat the carrier, then reassemble with the Detroit Locker.

I will then order new axles made to fit this Locker.
(poor lighting made the image appear rusty)

Vintage Windmills · 02-26-2017, 12:18 AM

subscribed

**RPOZ11** · 02-27-2017, 09:06 PM

Carrier apart :

GM part # :
3934635
GM Parts Catalog shows :
3934634
68-72 Ser. 20-30 (exc. 11,000 lb. axle)
Cataolg does NOT state W or W/O side load bolt

**RPOZ11** · 02-27-2017, 09:09 PM

Pinion Support

GM part # :
3843067

**RPOZ11** · 02-27-2017, 09:10 PM

YOKE

NO GM part # present

**RPOZ11** · 03-05-2017, 08:29 PM

Rotors :
Dura International # BR5523
Studs :
Dorman # 610-194

**RPOZ11** · 03-05-2017, 08:38 PM

And something new I learned today :
Escalade Hub Seals :
National # 710568
These seals resolve the leaking hub seal after they have grooved the housing

**RPOZ11** · 03-10-2017, 02:20 PM

Rear Caliper on for test fit:

**RPOZ11** · 03-10-2017, 05:08 PM

Carrier, support, & yoke stripped and ready for black powder coat :

**RPOZ11** · 03-19-2017, 02:17 AM

Just an update.
Working on rear calipers.
Possibly going to look into reproducing parking brake brackets and springs.
Aftermarket new calipers look ok.
The core GM calipers need some attention.
Powder Coating was delayed; so I'm a week behind now.
Once I can get all this resolved I can then order the axles.
Until then, same old slow process.
Never imagined the cost of doing these.
And I have 2 more to do.
More updates to come...

Shaky · 03-19-2017, 04:55 AM

Quote:

Originally Posted by RPOZ11

Never imagined the cost of doing these.

Yeah - the price on that bearing kit is eye-opening. I like my HO52, but if it ends up needing too much I might have to consider a 14-bolt. Nice work - following with interest...

**RPOZ11** · 03-19-2017, 05:02 PM

Well I'm into it deep now.
Goal is to complete it.

Powder Coating :

**RPOZ11** · 03-19-2017, 05:06 PM

Side Load Bolt :

**RPOZ11** · 03-19-2017, 11:27 PM

So here we have my 14 Bolt axles out sitting side by side as an example of the length comparison/differences.
17-30 spine difference.
Length difference using a straight edge of a bar to show how close they are & how I need to order shorter axles so that they dont hit or become a clearance issue.
Once I get the ring & pinion back from being assembled, I will then discuss further what is necessary with the axles.
Bear with me.
This will take a few weeks to finalize this all.

Theboatandcarman · 03-20-2017, 11:25 AM

i am looking forward to an axle comparison. i want to put a 14 bolt locker in my ho72

Shaky · 03-20-2017, 04:31 PM

Quote:

Originally Posted by RPOZ11

Well I'm into it deep now.

I hear you. I've spent a lot of money with less to show for it. You're gonna end up with a nice piece (or three).

**RPOZ11** · 03-25-2017, 06:48 PM

This one isn't mine but a similar rear disc swap.
With the vented rotors, the rotor outside diameter was a small bit too much from the manufacturer.
What was happening was that the rotor was slightly hitting the caliper pin.
His remedy was to take off ONLY enough material to keep it from hitting.
In the image below, you will see that he took off more material than was needed but leaving enough surface area to show full contact of the brake pads.

Just an FYI; but I thought it was worth sharing.
Maybe not all rotors have this problem.

02-11-2017, 04:28 PM	#27
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Axle housing, backing plates, inspection cover stripped. Now at powder coating shop to be covered in black. Attached Images __________________ 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

02-12-2017, 05:57 PM	#28
Tdrcreyn4 Registered User Join Date: Aug 2013 Location: Atlanta, GA Posts: 702	Re: Eaton HO72 rear axle subbed __________________ 1968 C10 292/3 spd - sold 1969 K10 350/3 spd/205 - sold 1971 K5 350/4 spd/ 205 - sold 1970 K20 350/350/205 - sold 1969 K20 396/400/205 - work in process

02-18-2017, 05:33 PM	#29
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Ready to reassemble ... Attached Images __________________ 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

02-18-2017, 06:49 PM	#30
B. W. Registered User Join Date: Nov 2014 Location: Bigfork, Montana Posts: 1,137	Re: Eaton HO72 rear axle You may have already found this info. The tag denotes what type of differential, can't remember if it's gear ratio or locker/open/ limited slip. GM used different shaped tags with no data on them to differentiate differentials (yeah, that was a play on words)

02-18-2017, 07:12 PM	#31
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle I do still have the tag from it. No info present on it. As suggested, the stamped code on the drop out defined its build. We are currently in the process of sizing up all the bearings for fit. Paint up the hubs then install the bearing races for it. Waiting for the disc brake brackets to arrive so we can try that on this. Still need to buy the calipers, rotors, brake lines, and rebuild the Ring & Pinion. Going to try the 14-Bolt Locker & 14-Bolt axles. Its all new for me. My first attempt at doing a rear axle __________________ 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 Last edited by RPOZ11; 02-18-2017 at 07:17 PM.

02-25-2017, 06:28 PM	#32
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle DIY 4X4 14-Bolt Disc Brake brackets They fit! 😎 Attached Images __________________ 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

02-25-2017, 06:59 PM	#33
BlueBullet Senior Member Join Date: Apr 2013 Location: Danvers Minnesota Posts: 967	Re: Eaton HO72 rear axle Looking good thanks for providing all the information __________________ 1972 K10 SWB wife's driver 1967 Pontiac GTO Big Bird - 1972 Longhorn K30 http://67-72chevytrucks.com/vboard/s...d.php?t=753294

02-25-2017, 07:42 PM	#34
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle My pleasure! I'm learning as I do it all. Eaton Detroit Locker 225S-10 DL 14- bolt Need a few weeks to disassemble the ring & pinion assembly, powder coat the carrier, then reassemble with the Detroit Locker. I will then order new axles made to fit this Locker. (poor lighting made the image appear rusty) Attached Images __________________ 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 Last edited by RPOZ11; 02-25-2017 at 11:17 PM.

02-26-2017, 12:18 AM	#35
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: Eaton HO72 rear axle subscribed __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

02-27-2017, 09:06 PM	#36
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Carrier apart : GM part # : 3934635 GM Parts Catalog shows : 3934634 68-72 Ser. 20-30 (exc. 11,000 lb. axle) Cataolg does NOT state W or W/O side load bolt Attached Images __________________ 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 Last edited by RPOZ11; 02-17-2018 at 01:58 PM.

02-27-2017, 09:09 PM	#37
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Pinion Support GM part # : 3843067 Attached Images __________________ 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

02-27-2017, 09:10 PM	#38
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle YOKE NO GM part # present Attached Images __________________ 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

03-05-2017, 08:29 PM	#39
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Rotors : Dura International # BR5523 Studs : Dorman # 610-194 Attached Images __________________ 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 Last edited by RPOZ11; 03-05-2017 at 08:35 PM.

03-05-2017, 08:38 PM	#40
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle And something new I learned today : Escalade Hub Seals : National # 710568 These seals resolve the leaking hub seal after they have grooved the housing Attached Images __________________ 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

03-10-2017, 02:20 PM	#41
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Rear Caliper on for test fit: Attached Images __________________ 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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03-10-2017, 05:08 PM	#42
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Carrier, support, & yoke stripped and ready for black powder coat : Attached Images __________________ 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 Last edited by RPOZ11; 03-10-2017 at 05:14 PM.

03-19-2017, 02:17 AM	#43
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Just an update. Working on rear calipers. Possibly going to look into reproducing parking brake brackets and springs. Aftermarket new calipers look ok. The core GM calipers need some attention. Powder Coating was delayed; so I'm a week behind now. Once I can get all this resolved I can then order the axles. Until then, same old slow process. Never imagined the cost of doing these. And I have 2 more to do. More updates to come... __________________ 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

03-19-2017, 05:02 PM	#45
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Well I'm into it deep now. Goal is to complete it. Powder Coating : Attached Images __________________ 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

03-19-2017, 05:06 PM	#46
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle Side Load Bolt : Attached Images __________________ 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

03-19-2017, 11:27 PM	#47
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle So here we have my 14 Bolt axles out sitting side by side as an example of the length comparison/differences. 17-30 spine difference. Length difference using a straight edge of a bar to show how close they are & how I need to order shorter axles so that they dont hit or become a clearance issue. Once I get the ring & pinion back from being assembled, I will then discuss further what is necessary with the axles. Bear with me. This will take a few weeks to finalize this all. Attached Images __________________ 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 Last edited by RPOZ11; 03-20-2017 at 08:43 PM.

03-20-2017, 11:25 AM	#48
Theboatandcarman Registered User Join Date: Aug 2015 Location: Harleysville, PA Posts: 398	Re: Eaton HO72 rear axle i am looking forward to an axle comparison. i want to put a 14 bolt locker in my ho72 __________________ keep on building. http://67-72chevytrucks.com/vboard/s...d.php?t=680094 2017 GMC Canyon diesel 1968 Chevrolet C20 1970 Mercedes 280S (WTB 1968 4wd barn door suburban)

03-25-2017, 06:48 PM	#50
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: Eaton HO72 rear axle This one isn't mine but a similar rear disc swap. With the vented rotors, the rotor outside diameter was a small bit too much from the manufacturer. What was happening was that the rotor was slightly hitting the caliper pin. His remedy was to take off ONLY enough material to keep it from hitting. In the image below, you will see that he took off more material than was needed but leaving enough surface area to show full contact of the brake pads. Just an FYI; but I thought it was worth sharing. Maybe not all rotors have this problem. Attached Images __________________ 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

Register or Log In To remove these advertisements.