Not sure where you are referring to as input and output shafts, but steering shaft diameter was the same size 37 - 48 in cars and through 52 in the F1. If your referring to the steering shaft diameter vs the sector shaft, again, the sector shafts are the same size 37-48 cars and through 52 on the F1. The 53 - 56 F100 has a larger sector shaft diameter.