[cdnus]

My solution after many tries at sealing gasket was to seriously degrease cover, trans flange,bolts, and threaded holes. Then spread a heavy bead of hi temp silicone on flange including holes and vent hole. Install cover, snug bolts and let set for at least 24hrs. Drill, tap and install vent in tailshaft housing..
Problem solved, not a hint of weeping or leaking anywhere.
Hope this helps.
Craig.
PS.
30+k miles.