[BonzoHansen]

Originally Posted by 1QWIKBIRD

That sounds right. I can tell you the axle seals are stock ford nine inch stuff, so it wouldn't surprise if the pinion seal is stock 12-bolt stuff. I doubt they'd spec a custom/odd-ball seal for the pinion because that would mean either the pinion stem diameter is different (not the situation) or the case was redesigned where pinion passes through (highly unlikely). All moser did was adapt the case to fit a TA mount and accept 3" axle tubes, most everything else is a hold over from the original GM 12-bolt. Stock gears bolt in, stock 12-bolt rebuild kits work so it would follow that a stock 12-bolt pinion seal is what you are looking for.

http://www.dennysdriveshaft.com/p873...nion_seal.html

http://www.strangeengineering.net/catalog/pdf/087.pdf

National Part No. 8460N

Order one and you are set.

if that's the case then take the part # down to the local parts store.