65 barracuda driveshaft length / transmission question

I'm running a stock, uncut Duster 340 driveshaft in my 65 Barracuda with later 4-speed and 8 3/4 rear. Even though the early A body wheelbase is two inches shorter than the later (Plymouth) A bodies, the distance from the trans cross member to the rear axle is the same. Just to complicate things, though, remember that while most A body Plymouths are 108 inch wheelbase and most A body Darts are 111 inch wheelbase, Demons/Dart Sports are 108, and Dart-based Plymouth Scamps are 111.

7 1/4, 8 1/4 and 8 3/4 all take different driveshaft lengths.

If I remember right, 3 and 4 speed manuals and 904 automatics are the same length (may have different yokes for different transmission output shaft diameters, but those are easily swapped), while 727s are longer.

Thus, you have to find a donor car with the correct trans and rear end.

SO - in your case, a driveshaft from a later 108 inch A body with 904 trans and 8 1/4 rear should bolt in.

Not sure how hard it might be to find what you need in the junkyard these days; the alternative would be to measure and have a new one made.