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Old 04-20-2006, 10:59 PM   #1 (permalink)
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aftermarket overdrives

Does anybody know about an aftermarket overdrive unit. How much are they? Do they work well? Where can I get one?


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Old 04-21-2006, 05:49 AM   #2 (permalink)
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Re: aftermarket overdrives

Gear Vendors, I mounts after your trans, so the driveshaft must be shortened. Look up gear vendors on ebay and their web site for prices.
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Old 04-21-2006, 04:02 PM   #3 (permalink)
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Re: aftermarket overdrives

US Gear is another type, www.usgear.com
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Old 04-22-2006, 10:48 PM   #4 (permalink)
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Re: aftermarket overdrives

greetings
i have a gearvendors in my 88 and all i can say is it is much better than an e40d no problems at all
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Old 04-23-2006, 12:00 PM   #5 (permalink)
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Re: aftermarket overdrives

I've got a "Ranger" overdrive in my unit. Made by "advance adapters" and works much like a us gear unit. It's a manual shift though(2 sticks) I really like it...their website here...


It's not about the money you save in fuel, it's about the driveability of the truck...makes a huge difference, and worth every penny.

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Old 04-23-2006, 08:18 PM   #6 (permalink)
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Re: aftermarket overdrives

Don't get too wound up, until you check your bank book, they vary in price when found used, but from my point of view, new is exceedingly expensive.
You would drive many miles before payback is achieved.
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Old 05-08-2006, 09:44 AM   #7 (permalink)
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Re: aftermarket overdrives

It depends on your purpose. I have 2 trucks, one with a Gear Vendors and one with a US Gear overdrive. I like the GV for its smooth, automatic shifting with my C6 tranny. I like the US Gear for its heavy duty 30,000 lb towing capacity. The US Gear is definately a more robust unit.
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Old 05-08-2006, 10:47 PM   #8 (permalink)
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Re: aftermarket overdrives

If you break the US Gear it will stop you right there in your tracks. If you break the Gearvenders you loose the over or underdrive and still have your oem trans to get you home. Gearvenders are about $2700.00 new but well worth it on driveability.
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Old 05-09-2006, 07:01 AM   #9 (permalink)
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Re: aftermarket overdrives

I bought a new GV unit 52,000 miles ago. I figure at current fuel prices and the mileage boost I get, I need to drive it about 80,000 miles to pay for it.

I bought new because I plan on keeping it for the next truck I buy. If this truck dies, whatever I get it will go on so I planned on having it for a long time.

When I was debating buying one I talked to a guy who had 300,000 on his and it had been on 3 different trucks. He told me it cost about $500 to get the new computer, adapters and move it over to the new truck each time.

If I can keep mine the same amount of miles it will be well worth the original cost. I also count in the fact that by running at lower RPM's I am saving other costs. My truck has the 4 Speed and runs at high RPM's. By running lower I am saving water pump, fuel pump, and engine parts from running so hard.
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Old 05-10-2006, 11:06 PM   #10 (permalink)
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Re: aftermarket overdrives

[ QUOTE ]
If you break the US Gear it will stop you right there in your tracks. If you break the Gearvenders you loose the over or underdrive and still have your oem trans to get you home. Gearvenders are about $2700.00 new but well worth it on driveability.

[/ QUOTE ]

Not true. I typed up a big long examination of failure modes the other night, then the &*%^*% computer erased it when I tried to post. Oops. Point is, the GV unit is much more complicated and more likly to fail castrophically. US gear unit is proven hevvy duty technology (basically a small 2 speed version of the roadranger trannies in semis) whereas the GV is a beefed up version of the norman deville (unuser on spelling) overdrive box used in many 60's european cars. Fundemental design differnce. The GV is simpler to use, but not as heavy duty. I'd say both are equally likely to strand you, and the liklyhood of it actually happening is very small for both, assuming they are correctly used.
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Old 05-18-2006, 10:50 PM   #11 (permalink)
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Re: aftermarket overdrives

I have a US Gear on a 2wd C6 and love it.

I'm not sure if your truck is 2wd or 4wd but here's one point of interest:
The GV OD installs behind the front wheel gear box so OD can only be used when the truck is in 2wd mode. The good news is that on 4wd trucks, only the rear driveshaft length needs to be modified.

The US Gear OD installs in front of the front wheel gear box so both front and rear driveshaft lengths have to be modified on 4wd trucks. I found mine on eBay and installed it myself. Now to get my 4.10 gears down to 3.56's.
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