>I swapped an o/d transmission into my 1972 B when I rebuilt the engine.
> You're right about just needing the transmission, driveshaft, and wiring
>but the switch on my 72 was already there! It's part of the wiper switch on
You do not have to use a diff. driveline for O/D. I put an O/D in my '72 as
well, and when on the floor the to trannies are exactly the same length.
Make sure that the Trans. you put in has a first and second gear lockout
switch that works this prevents O/D from being selected in first and second
gears. The higher shaft speeds of first and second gears are very bad for
the O/D unit..
Hope this helps...