The Stovebolt Site Forums The Parking Lot Big Bolts Speed -up?

Ed,

I'm not sure about the interchange, but it's all about the ratio of the final rear end gear, whether you have a 2-Speed or not. A 2-Speed's purpose is to have a Low Range for "Split Shifting" to give you more gears pulling heavy loads. Going to a 5-Speed trans won't make a difference unless you have an Overdrive. They were no 4-Speed or 5-Speed Overdrive transmissions available in the old days that I have ever heard of (info revised on Pg #2). Not sure if there are any newer 5 or 6 Speed OD's that would interchange. I believe there were OD Aux. Trans that would work (you would then have 2 sticks) and there are a few on here that have some good experience with them who I'm sure will be jumping in soon, but I would say that it is not a very easy installation. The most sensible fix would be to find a rear with a higher gear and depending how you use the truck, a 2-Speed rear may be necessary.

Bill