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I have a 64 f100 with a 292 4spd. I have decided to replace the 4spd with a 3spd, because the 4 speed is geared low. What year 3 spd. out of any kind car made then can fit on to a truck 292 y-block v8?
For about the same mount of money, and a whole lot less trouble, if you have a Ford 9" rear, change out the rear differential center punkin for a very low geared one, say 2.75 or 3.00.
You'll lower your RPMs significantly, and be able to use 1st gear as your starting gear.
Besides, changing the transmission won't change the final ratio, it is the same for all transmissions except overdrives: 1:1.
Changing the transmission from a 4 speed to a 3 speed will only give you a higher 1st gear, that's all.