Gear Venders 22% Overdrive mounted on a GM 400 transmission. These overdrive units can be combined with our performance TH400 transmissions and converters to produce an overdrive transmission rated at over 1000 horse power. This overdrive unit can be added to most cars and trucks with 400 transmissions for $CALL (4 inch tail). TH400 transmissions with a 9 in tail housing such as the 454 SS, $CALL.

Gear Venders 22% Overdrive for Ford C6 transmissions. These overdrive units can be combined with our performance C6 transmissions and converters to produce an overdrive transmission rated at over 1000 horse power. This overdrive unit can be added to most cars with our C6 transmissions for $2695.00.