Gear Vender Over/Under drive unit
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Senior User
Joined: Dec 2004
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From: Knoxville, Tn
Gear Vender Over/Under drive unit
I have a gear vender unit in my 1987 F-350 and I was wondering what kind of fluid it takes. I have a switch on me dask that says Auto/Manuel with a red and green light that says overdrive.
Hotshot
Joined: Feb 2004
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From: Marengo, Iowa
1-800-999-9555 is the number to call and ask, otherwise, www.gearvendors.com I actually called them and asked about it, and they sent one out to me after asking which model I had.
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Joined: Dec 2004
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From: Knoxville, Tn
I can't thank you enough for the info!!!! I called Gear Vender and they are sending me a manuel and a seal for the sump all for free!!!! Very,Very nice and helpfull people, they care about their customers. They even told me when unit was installed. This web sight came through again!!!! Thanks and God Bless, John
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From: Knoxville, Tn
I like mine ok,but I haven't had it long and don't really know how to use it properly yet. My transmision is a C-6 and it has had a leak since I've had the truck so I don't think it has been working properly. I am having seals put into trans and I am getting a manuel for gear vender and I think I'll really like it. I'll let ya know. Thanks and God Bless, John
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Hotshot
Joined: Feb 2004
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From: Marengo, Iowa
Haven't had a chance to run it yet, it came out of a wrecked truck, and the truck I put it in hasn't made it onto the road yet...
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From: LaPorte, CO
I had one in a 1988 E350 van with a 460 gas motor, C-6 Auto and 4.10 rear gears.
I drove it 130,000 miles with no problems. The van is still in use with at least 175,000 miles and still no problem with the GV unit.
It works great for towing with the C-6 transmission because you can use it in all 3 gears as a gear splitter. It just takes some experimenting to get the shift sequence right for downshifting from a direct drive gear to the next lower OD gear for climbing a good grade with a load.
The only caution I would offer is NEVER have it engaged when you are compression braking with any load against it. The OD clutches are not designed to be loaded in the reverse direction.
I drove it 130,000 miles with no problems. The van is still in use with at least 175,000 miles and still no problem with the GV unit.
It works great for towing with the C-6 transmission because you can use it in all 3 gears as a gear splitter. It just takes some experimenting to get the shift sequence right for downshifting from a direct drive gear to the next lower OD gear for climbing a good grade with a load.
The only caution I would offer is NEVER have it engaged when you are compression braking with any load against it. The OD clutches are not designed to be loaded in the reverse direction.
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From: LaPorte, CO
Compression braking is when you use the engine compression to hold your speed when descending a grade. For example, I often shift down when descending a long grade to avoid using/abusing my brakes. Any time you back out of the throttle on a gas engine, the slowing effect is compresssion braking. Most diesels except the 6.0 Powerstroke require additional equipment to successfully do this.
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