Yes, but that's just my best guess. I'd sure take the trans off, dissasemble it to remove the diff and check it out to make sure. Nothin' worse than replacing something on a guess and then having the same problem show up.

I've had lots of them break, that's why I guessed that was it and also I have been able to remove the bolt and thrust washer pack just by removeing one axle and using an allen wrench to verify the thrust washer is broke. I actually can replace it that way too (with it still in the truck)