johnr9q

Does anyone that has had a U.S. Gear or Gear Vendor Overdrive installed have good numbers on the increase in fuel economy before and after installation? Also how about durability of the unit? A knowledgable person told me as the RPM's drop a diesel "hits harder" than a gas rig, causing failure of the overdrive unit or other drive train components
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captrfsella

A diesel is designed to provide torgue,(lug),, so ,, putting OD so to speak is good and will improve economy and still within a certain range of power demand to a good job.. Yes it will put little more stress on driveline.. but it will still be within limits... So enjoy and go forit..you'll be glad you did.

Capt ric

infidel

Almost 100% of the people who have installed overdrive units report no gain in mpgs.
In fact one the unit manufacturers you mention states this on their website

Dieseldude4x4

My sons 94 with 410 gears and the Gear Vendor got 18 to 20 all the time on the road. It dropped the rpm's about 400 or so going into to overdrive. That thing was sweet.

Shovelhead

You can buy a lot of fuel for the cost of an overdrive unit & installation.

I've seen some state that the "cost vs savings" point won't occur for many thousand miles.

storx

if your going to go about doing this you mightest well just do a conversion from a vp-44 pump to a good ole p7100 pump and run SVO veg oil to the engine. There is a guy localy that did it on an old 12valver and has an salvaged 100 gallon tanker tank strapped in the back of the truck under the camper shell and he has been running the svo for nearly 2 years now with no problems. He owns a salvage company and uses the truck to run truck loads of steel, aluminum, and copper to the recycle center 3 hours away. he is always running some pretty big loads on his truck.

RowJ

I could possibly see some benefit with a 5 speed...but not with your automatic..... unless your turning a 410 rear end?
Have also read several disappointed reports of little or no gain in mileage.

RJ