4-speed cranks are drilled deeper for the input shaft of the transmission. A lot of cranks were drilled, so even if it was originally an auto it could be drilled. Also, if it isnt drilled you can either cut the end of the transmission input shaft or drill the crank....I cut the end of mine off and havnt ever had a problem. I also recommend ditching the bronze pilot bushing and go with the newer dakota roller bearing.