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Gear Vendors TH400 Under/Overdrive With 4 Tailhousing

GV4000 - Gear Vendors TH400 Under/Overdrive With 4" Tailhousing

Give your transmission up to twice the forward gear ratios with the UNDER/OVERDRIVE auxiliary transmission from Gear Vendors. This supplemental planetary gearbox adapts to the output shaft of your existing transmission to provide an extra gear of 0.78 :1. The initial benefit is the addition of a 22% overdrive in high gear, but because it can be engaged in any gear, it doubles the number of ratios available in any transmission. Increase fuel economy and use your engine's power more efficiently!

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Product #: GV4000

Arriving Soon!

MSRP: $2964.99 ea
Classic: $2694.99 ea



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