Most 1969 and 1970 351 engines 3 or 4 speed manual transmission. Shaft diameter 2-3/4 inches. Length 53-1/4 inches, measured on U-joint centers. Used and 'as balanced' from the factory.
*NOTE* 1970 M-code - 351C-4V engines came from the factory with 3 inch drive shafts.
Ask about slip yokes. Shipping is oversized due to length.