8-3/4 Auburn sure grip axle issue

-
TurboGLH

TurboGLH

FABO Gold Member
FABO Gold Member
Joined
Jul 29, 2017
Messages
621
Reaction score
692
Location
CT
I had to do some brake work, and found a bad wheel bearing, I decided to swap over to the later version green bearings while I was in there.

Car is back on the ground, but has trouble moving, up on stands it works fine, but nothing on the ground. Driveshaft out and it seems fine, dig a little more and find the if I have someone hold the brakes, I can turn the pinion while the wheels stay stationary.

Pull the axles and diff out, take some measurements and it looks like the axles engage the cone and the spider on one side, but not the other.

Axles are, to the best of my knowledge, shortened C body (BBP conversion) and they're standard 27-11/16 a body length.

I can't find any info about an incompatibility with the Auburn factory diff and that axle length, except Mancini. They sell 28" yukons and explicitly say they do not work with the diff in question.

Can anyone shine any light on this?
 
Did you remove the thrust button from the differential?
 
The axles will engage the center section with or without the button.

The button can be an issue with green bearing use though.
 
Alaskan_TA said:
The axles will engage the center section with or without the button.

The button can be an issue with green bearing use though.
Click to expand...
Button is out, but the issue is that the axles are too short, not coming in contact with the button. With the diff out, axles installed I'm getting 2.625 between the axle ends, by my measurements on the diff, that's just enough to engage the cones, but not enough to engage both spiders.

Yukon Gear Rear Axle Shaft, 28.0 in. shows that someone has had a similar issue with similar length axles.
"This axle is not compatible with factory posi units that use a 2-piece side gear."
 
If you have a stock A-body housing and stock 5 x 4.5" bolt pattern drum brakes, the axles must measure 28" straight, not at an angle (axle flange to end of spline).
 
DoctorDiff said:
If you have a stock A-body housing and stock 5 x 4.5" bolt pattern drum brakes, the axles must measure 28" straight, not at an angle (axle flange to end of spline).
Click to expand...

I'm definitely not getting 28" flange to spline end. I'll need to recheck tomorrow, but my quick measurement was 27.75" (verified stock a body housing length, and it's using stock 5x4.5 10" 2.5 wide drums)

Unfortunately I bought the car with lots of work already done, and I'm cleaning up the mess.

Will a diff with a more traditional side gear setup work with my axle length? I might have to move up my truetrac purchase is so.
 
U could always by axles from the Doctor. There around $300.00 for any legnth u need. And they come with bearings installed to. Cass is da man!!! Kim
 
oldkimmer said:
U could always by axles from the Doctor. There around $300.00 for any legnth u need. And they come with bearings installed to. Cass is da man!!! Kim
Click to expand...

I could, but it's $300 for axles vs $530 for a diff I wanted to buy anyways. I order Dr. Diffs helical diff and a set of bearings last night .
 
You must log in or register to reply here.
-

Back
Top