Quite often more is damaged than just the stud or coupler when the shaft
comes loose...All that holds the setup together is a circlip. If it comes
loose, the shaft will back out on decel after a bit and quite often takes
out the support collar on the bell housing. If you had no problems prior
to engine removal...Just remove bell housing and repl clip and or collar,
assuming mainshaft surfaces are still ok. The diff gets in the way of
removing easily but can be rotated & futzed with until you can work the
pieces in & out. Good Luck..
Daryl of AA Transaxle, Duvall, Wa.
(425) 788-4070
1-877-377-0773 toll free
aatransaxle.com