If I were to have an older, U, EL, F/FL knuck/pan/side valve four speed tranny case, could I swap in the gears from 1964 or up tranny, as long as I used the short mainshaft?
Or, in other words, switch the guts from a later tranny into the old case, but again, using/ substituting the shorter mainshaft. ??
If it's possible, what would be the latest year tranny that I could steal the guts from?