Adding an overdrive (BW T-19 to ZF-5 transsmission swap)
 

If you’ve never driven a vehicle more than a couple decades old, you probably take overdrive for granted.* You may not even have a clear idea what that term means.That 5th or 6thgear, with a ratio smaller than 1.0 (meaning the driveshaft is turning faster than the engine) lowers the engine RPM speed on the [...]

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YES! This is exactly what i need to do in my '77 F100!

i will be watching closely, thanks