The one that seals the case which houses the main input shafts seal. I put a brand new one on, haven't even installed the Trans yet but am now getting a new Trans and want to swap the cover with the new input shafts seal to the replacement Trans.
"torque gets you off the line...& hp gets you over the line." - TTKeeper
Follow Ups
can the front cover Trans gasket be reused? - LivinTheDream10:45:42 11/13/14