if its very thin it should go between the yolk and the bearing and most likely stuck to the yolk when you pulled it out. Good Luckif its very thin it should go between the yolk and the bearing and most likely stuck to the yolk when you pulled it out. Good Luck
Answers & Comments
If you didnt open the differential and just changed the seal it shoud be the washer under the nut above the yolk
if its very thin it should go between the yolk and the bearing and most likely stuck to the yolk when you pulled it out. Good Luck