Hello I had oil in my bellows so I replaced the necessary seals to fix the problem. My shaft did not have a race shim or washer. It doesn’t appear that there is a stamp on the back of the drive either. Drive is OM117251

thanks in advance.

They made a change sometime in the OM serial # group from a
non shimmable pinion to a shimmable pinion, the newer ones have
the inner race that has a shoulder incorporated into it, the olders
had the shoulder as a separate piece is how you would tell the difference

the older units didn’t use shims

Ok if it didn’t have them I’m assuming it is an older unit.