Drive Shaft Length

You can use drive shafts from Dusters, Barracudas and Valiants. As long as you use one from a 4 speed, 904 or 3 speed with the 7 1/4 rear. Should not be hard to find. I ran a 71 340 4 speed drive shaft in my 64 Barracuda for years. I had swapped the 8 3/4 rear in to it.