[olddog]

Excuse me if I mixed terms and confused things. On the TKO-600 the input shaft runs pretty much the length of the transmission and it includes the gear that mates up to 5th gear. So to change the fifth gear ratio you have to change out the shaft. I'm not sure if it should be called the main shaft, the input shaft, or some other name.

There are two different length shafts available for Fords.