Re: Eaton HO72 rear axle
 

Nice progress!

Re: Eaton HO72 rear axle
 

Axle housing, backing plates, inspection cover stripped.

Now at powder coating shop to be covered in black.

Re: Eaton HO72 rear axle
 

subbed

Re: Eaton HO72 rear axle
 

Ready to reassemble ...

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)

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

Re: Eaton HO72 rear axle
 

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

Re: Eaton HO72 rear axle
 

Looking good thanks for providing all the information

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)

Re: Eaton HO72 rear axle
 

subscribed

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 :confused:

Re: Eaton HO72 rear axle
 

Pinion Support

GM part # :
3843067

Re: Eaton HO72 rear axle
 

YOKE

NO GM part # present

Re: Eaton HO72 rear axle
 

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

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

Re: Eaton HO72 rear axle
 

Rear Caliper on for test fit:

Re: Eaton HO72 rear axle
 

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

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...

Re: Eaton HO72 rear axle
 

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...

Re: Eaton HO72 rear axle
 

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

Powder Coating :

Re: Eaton HO72 rear axle
 

Side Load Bolt :

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.

Re: Eaton HO72 rear axle
 

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

Re: Eaton HO72 rear axle
 

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). :metal:

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.