Question about pinion setup bearing.

[jonrpick]

Well, I lost my momentum (again) last month when I got sick for over a week. I need to get back on it.

My axle housing was professionally blasted and then I painted it. I'm ready to start putting the guts back in it, with all new bearings.

My question is about a "setup" bearing for the pinion. From what I understand, you press off the old inner bearing and clean out the inside of it with a Dremel, so that it'll slip on and off the pinion easily. Is this correct?

Also, in terms of setup, am I to assume that all inner bearings are the same thickness? Because in my mind, pinion depth would change when you swapped the setup bearing for the new bearing.

Discuss.

 

[BGKYK5]

10B? D60? I don't have any answers for you - the only diff I have setup so far is a 14BFF, but I'd like to hear what others say for when I do my D60.

To make a short story long - Subscribed.

 

[roadnotca]

New components, new set-up.
What do you mean by "blasted" (I know you mean abrasive cleaned, but what kind)?

 

[jonrpick]

10B? D60? I don't have any answers for you - the only diff I have setup so far is a 14BFF, but I'd like to hear what others say for when I do my D60.

To make a short story long - Subscribed.

10-Bolt rear

New components, new set-up.

Ok... where do I get the new setup bearing then?

 

[roadnotca]

I've done two 10Bs, so I'm a hack. Actually, they work.
What history are we talking, blown diff or just a ratio change?

 

[jonrpick]

I've done two 10Bs, so I'm a hack. Actually, they work.
What history are we talking, blown diff or just a ratio change?

Replacing bearings... Same gears and carrier.

 

[daleearnhardt01]

I just use the old bearing as a set up bearing.... Its always right in the end for me..

 

[Hogback Fabrication]

I've always used the old bearing for setup and the pattern didn't change after installing the new bearing.

Some gear companies sell new setup bearings.

 

[roadnotca]

Replacing bearings... Same gears and carrier.

1. What type of blasting did you have done (all will require heavy duty cleaning on your part)?
2. Since you're replacing brgs, was there shrapnel, or just loud rumble?
3. If you're only replacing brgs, I'd just bolt it all back up, and then pin all of your work on the pattern check.

 

[jonrpick]

1. What type of blasting did you have done (all will require heavy duty cleaning on your part)?
2. Since you're replacing brgs, was there shrapnel, or just loud rumble?
3. If you're only replacing brgs, I'd just bolt it all back up, and then pin all of your work on the pattern check.

1a. I paid a pro to blast it. He said he used "cold slag".
1b. The diff cover was on it, and the axle tubes and pinion opening were plugged up with paper towels.
1c. The pro knows how to blast axles and took precautions to avoid getting much inside it.
1d. Interior cleaning will consist of running a brake cylinder hone inside the axle tubes with an extension to loosen any rust/scale/etc, followed by liberal blasting with brake cleaner, and then finished up by using a wooden dowel to push multiple shop rags through the "bore" with something like gun oil to protect against rust during reassembly. Cleaning the interior of the pumpkin will be done via brake cleaner and tooth brushes, and possibly compressed air as needed.

2. There was rumbling, worse during acceleration. Upon disassembly the bearings seemed fine to my n00b eyes and hands, but I found bits of unidentified debris.

3. I assume using a really accurate set of calipers would help me determine how close in thickness the new vs. old bearings are?

 

[roadnotca]

1a. I paid a pro to blast it. He said he used "cold slag".
1b. The diff cover was on it, and the axle tubes and pinion opening were plugged up with paper towels.
1c. The pro knows how to blast axles and took precautions to avoid getting much inside it.
1d. Interior cleaning will consist of running a brake cylinder hone inside the axle tubes with an extension to loosen any rust/scale/etc, followed by liberal blasting with brake cleaner, and then finished up by using a wooden dowel to push multiple shop rags through the "bore" with something like gun oil to protect against rust during reassembly. Cleaning the interior of the pumpkin will be done via brake cleaner and tooth brushes, and possibly compressed air as needed.

2. There was rumbling, worse during acceleration. Upon disassembly the bearings seemed fine to my n00b eyes and hands, but I found bits of unidentified debris.

3. I assume using a really accurate set of calipers would help me determine how close in thickness the new vs. old bearings are?

Since you have it broken down to the bare diff casting/axle tubes, I'd say pressure wash it and let it dry. Spray WD40 inside and leave it at that.
Brg width tolerances are about +/-.0002. Way smaller than what the pattern check will correct.
Can you post pics of what the tooth faces look like?