Gear Vendors Under/Overdrive

Catalog Item # 20070d

The finest quality Auxiliary Transmissions offer the ultimate in horsepower and performance.

Most auxiliary transmissions are just dual ranges — low gear for towing and high gear for running empty. Gear Vendors Under/Overdrive is built for gear-splitting (giving you a progression of gears with half the drop in rpm) so you maintain power with close ratio performance. Gear Vendors is the only auxiliary transmission that permits shifting under any throttle condition. After it’s installed, your vehicle will have twice as many underdrive ratios plus 3rd-direct and an overdrive gear (3rd-over) for towing. Provides increased engine performance of more than 40 hp and 60 lb. ft. of torque without modification to the engine. The overdrive will pay for itself in fuel mileage alone. In addition, your engine slows down 22%, so the same rpms that currently take you 500 miles will take you 640 miles. Mfr. 2 year warranty for noncommercial use. USA. Special Order.

Technical Specifications

Camper's Choice Rating

Reviewer rating of 5 stars based on 10 reviews (5 Based on 10 Reviews)

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Great engine saver

by Michael Harrington – March 12, 2006
5 out of 5 stars

I bought this unit July of '05. The La Mirada, CA store handled the transaction for me. I had it installed on my '03 Superduty wi

New life in an old rig

by Brian – March 09, 2010
5 out of 5 stars

I installed this unit in a 1986 Pace Arrow that I had been driving for 10 years in 2006 and set out from NH to WA and CA. The fir

Gear vendors over-under drive. Wonderfull!!!!

by mel clark – September 20, 2006
5 out of 5 stars

I have one of these in my 1984 Ford F250 4X4. I have 5:16 limited slip gears. The engine is a 6.0 ldiesel with an add on turbo.

Gear Vendors

by Richard Feist – May 29, 2006
5 out of 5 stars

This is worth the money in every way - even if it doesn't pay for itself in fuel savings (which it might at today's prices) - The

one excellent product

by Barney Fife – January 17, 2006
5 out of 5 stars

This unit is well built, does exactly what it says,and adds that extra gear just wear you need it. I will always have one on any t

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