Getrag differentials

[Blue85]

The tool finally came in the mail and with pipes I was able to break all the lumber and rebuild with wider lumber. Eventually the impact did take the nut off without the Chinese socket breaking .

Sure enough, the pinion bearings and races were all pitted.

 

[Chickntrk]

Wow, what a pile….it’s amazing how shitty new vehicles are made for what they cost

 

[Blue85]

So the tapered rollers replace the balls.


There is a shim under the pinion bearing. I put it all together with new bearings and the same shim, set the pinion nut to 0 endplay, left the old carrier bearings on and ran a test pattern. It's not bad. What do you think? I'll have to locktite the heck out of the pinion nut before I'm done.

 

[Fastereddie]

So the tapered rollers replace the balls.
View attachment 455305

There is a shim under the pinion bearing. I put it all together with new bearings and the same shim, set the pinion nut to 0 endplay, left the old carrier bearings on and ran a test pattern. It's not bad. What do you think? I'll have to locktite the heck out of the pinion nut before I'm done.

View attachment 455306

View attachment 455307

What was your backlash with that pattern?

 

[Blue85]

.008

 

[Fastereddie]

Like you said, it’s not bad. I’d be curious what .006 backlash would look like.

 

[Blue85]

I've always assumed that with a used gearset you want the spacing to be the same as previous and therefore backlash will be a little bigger than with new gears.

 

[Fastereddie]

I've always assumed that with a used gearset you want the spacing to be the same as previous and therefore backlash will be a little bigger than with new gears.

So it was at .008 before you took it apart.
Did you happen to run the grease pattern before you disassembled it?

 

[tarussell]

I agree if the previous back lash was the same leave it be and run it - at this point it’s a far better option to match the original wear pattern instead of trying to find the ultimate pattern on a used set of gears . Like @Fastereddie said at .006 it would be nice to see the results but if it was at .008 before then stick with it.
Like an old song from the group Alabama said “She’s close enough to perfect” — it’s a used gear set; put some 85/140 synthetic weight oil in it and run it.

 

[Blue85]

Alright, all new seals, reassembled and full of 75W-90 synthetic. Probably stab it back in tomorrow.

 

[Blue85]

Did stab it back in and it's as quiet as I should have probably expected a Cadillac to be (i.e. zero noise from the rear under decel, coast, boost, etc.). So as of now I'm winning. Will have to keep an eye out for noise or weirdness and retorque all the fasteners.

 

[Fastereddie]

Did stab it back in and it's as quiet as I should have probably expected a Cadillac to be (i.e. zero noise from the rear under decel, coast, boost, etc.). So as of now I'm winning. Will have to keep an eye out for noise or weirdness and retorque all the fasteners.

Nice work