Most 1969 and 1970 351 engines with FMX transmissions. Shaft diameter 3 inches. Length 53-9/16 inches, measured on U-joint centers. Used and 'as balanced' from the factory.
*NOTE* Some 1970 M code 351C-4V engines came from the factory with 3-1/2 inch drive shafts. We think it may have been those with competition handling packages. Does anyone know for sure?
Ask about slip yokes. Shipping is oversized due to length.