Thrust washer for spider gears

[raggedjim]

I have looked the internet from one end to the other looking for the thrust washers (or shims) that go behind the spider gears in a 12 bolt chevy truck positrac rearend. If anyone has any idea where I should look for them it would be appreciated.

Thanks, Rg

After much research and gnashing of teeth I found GM #3957940 for the washers BUT most places have them back ordered. Tom's differentials has them in stock so I have them ordered. I'll update once they come in.

Tom's has a good catalog of differential parts. https://tomsdifferentials.com/

Washers came in and installed easily. Most of the ones you will find online are NOT the correct ones! If they have the lip around the id they are not for our trucks.

Good luck, Rg