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Gear Vendors Under/Overdrive

Catalog Item # 20070d
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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 Specs

Tech Specs

Weight: 57 lbs.

Manufacturer: Gear Vendors Inc

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Gear Vendors Under/Overdrive: Customer Reviews

Camper's Choice Rating

(5 Based on 10 Reviews)

Reviewed by 10 customers


one excellent product

171 out of 303 people found this review helpful.
January 17, 2006
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 tow vehicle I own in the forseable future
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Great engine saver

214 out of 370 people found this review helpful.
March 12, 2006
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 with a V10. It was so nice to be able to pull Mill Creek Grade at 40 mph without my engine pushing 4,500 rpms. In one short runI had to run it in first gear for about a half of a mile. Now I do it in "2nd under". I am using 3.73's axles in my 4X4 but I think it would be better with 4.30's. But I can wait until I see what she does cross country. Getting the hang of shifting is a little tricky, but it's a really well made unit. I recommend it for the V10 motorhomes.
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Gear vendors over-under drive. Wonderfull!!!!

267 out of 723 people found this review helpful.
September 20, 2006
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. I average 12 MPG pulling my 1985 Prowler 5th wheel. Even better without! Well worth the cost. I am outpulling other fords and chevy's and dodges (Even the NEWER models) on most hills. Arizona is mostly 75mph, on the freeways, and I can cruise all day at that speed and get that mileage. Just returned from a cross-country trip, and with the price of diesel now-a -days, I was sure gald I had this installed. My over-drive unit is over 12 years old and still going strong.!!!
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