Originally Posted by gringeltaube

Exactly that, YES.
.... 200 miles at 55mph on a real hot day, main seal was leaking really bad so that everything plus clutch got soaked and it started slipping ... !
Drained about two gallons to correct level!, removed inspection cover plate, flushed clutch as good as possible with solvent, drove back home normal and dry and never had that problem again.
(lesson learned and not forgotten, after almost 20 years.....!)

G.