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Old 02-02-2017, 10:47 AM   #26
57taskforce
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Re: Eaton HO72 rear axle

Quote:
Originally Posted by RPOZ11 View Post
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!
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Old 02-11-2017, 04:28 PM   #27
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Re: Eaton HO72 rear axle

Axle housing, backing plates, inspection cover stripped.

Now at powder coating shop to be covered in black.
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Old 02-12-2017, 05:57 PM   #28
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Re: Eaton HO72 rear axle

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Old 02-18-2017, 05:33 PM   #29
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Re: Eaton HO72 rear axle

Ready to reassemble ...
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Old 02-18-2017, 06:49 PM   #30
B. W.
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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)
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Old 02-18-2017, 07:12 PM   #31
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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
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HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM

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Last edited by RPOZ11; 02-18-2017 at 07:17 PM.
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Old 02-25-2017, 06:28 PM   #32
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Re: Eaton HO72 rear axle

DIY 4X4 14-Bolt Disc Brake brackets
They fit! 😎
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Old 02-25-2017, 06:59 PM   #33
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Re: Eaton HO72 rear axle

Looking good thanks for providing all the information
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Old 02-25-2017, 07:42 PM   #34
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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)
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HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM

73 Chevy C/20 454 Cheyenne Super CS #'s matching; Built TH400 / Allison convertor, 3:21.1 Eaton Posi, Tilt, AC


Last edited by RPOZ11; 02-25-2017 at 11:17 PM.
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Old 02-26-2017, 12:18 AM   #35
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Re: Eaton HO72 rear axle

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Old 02-27-2017, 09:06 PM   #36
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Re: Eaton HO72 rear axle

Carrier apart :

GM part # :
3934635
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HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM

73 Chevy C/20 454 Cheyenne Super CS #'s matching; Built TH400 / Allison convertor, 3:21.1 Eaton Posi, Tilt, AC


Last edited by RPOZ11; 02-27-2017 at 09:12 PM.
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Old 02-27-2017, 09:09 PM   #37
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Re: Eaton HO72 rear axle

Pinion Support

GM part # :
3843067
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Old 02-27-2017, 09:10 PM   #38
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Re: Eaton HO72 rear axle

YOKE

NO GM part # present
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HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM

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Old 03-05-2017, 08:29 PM   #39
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Re: Eaton HO72 rear axle

Rotors :
Dura International # BR5523
Studs :
Dorman # 610-194
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HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM

73 Chevy C/20 454 Cheyenne Super CS #'s matching; Built TH400 / Allison convertor, 3:21.1 Eaton Posi, Tilt, AC


Last edited by RPOZ11; 03-05-2017 at 08:35 PM.
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Old 03-05-2017, 08:38 PM   #40
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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
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HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM

73 Chevy C/20 454 Cheyenne Super CS #'s matching; Built TH400 / Allison convertor, 3:21.1 Eaton Posi, Tilt, AC

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Old 03-10-2017, 02:20 PM   #41
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Re: Eaton HO72 rear axle

Rear Caliper on for test fit:
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73 Chevy C/20 454 Cheyenne Super CS #'s matching; Built TH400 / Allison convertor, 3:21.1 Eaton Posi, Tilt, AC

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Old 03-10-2017, 05:08 PM   #42
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Re: Eaton HO72 rear axle

Carrier, support, & yoke stripped and ready for black powder coat :
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HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM

73 Chevy C/20 454 Cheyenne Super CS #'s matching; Built TH400 / Allison convertor, 3:21.1 Eaton Posi, Tilt, AC


Last edited by RPOZ11; 03-10-2017 at 05:14 PM.
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Old 03-19-2017, 02:17 AM   #43
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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...
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Old 03-19-2017, 04:55 AM   #44
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Re: Eaton HO72 rear axle

Quote:
Originally Posted by RPOZ11 View Post
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...
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Old 03-19-2017, 05:02 PM   #45
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Re: Eaton HO72 rear axle

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

Powder Coating :
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Old 03-19-2017, 05:06 PM   #46
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Re: Eaton HO72 rear axle

Side Load Bolt :
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Old 03-19-2017, 11:27 PM   #47
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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.
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HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM

73 Chevy C/20 454 Cheyenne Super CS #'s matching; Built TH400 / Allison convertor, 3:21.1 Eaton Posi, Tilt, AC


Last edited by RPOZ11; 03-20-2017 at 08:43 PM.
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Old 03-20-2017, 11:25 AM   #48
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Re: Eaton HO72 rear axle

i am looking forward to an axle comparison. i want to put a 14 bolt locker in my ho72
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Old 03-20-2017, 04:31 PM   #49
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Re: Eaton HO72 rear axle

Quote:
Originally Posted by RPOZ11 View Post
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).
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Old 03-25-2017, 06:48 PM   #50
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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.
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