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Old 11-12-2002, 12:52 AM
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Question th400 Overdirve?

I looking to put an overdrive in my th400. What is the best route to take to get this done? What company makes an overdrive for the th400? What kind of money are we talking? It's for my 68 Chevy truck to help with gas milage, not a serious horsepower setup. Thanks!!

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Old 11-12-2002, 03:25 AM
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Check out Gear Vendors. <a href="http://www.gearvendors.com/" target="_blank">http://www.gearvendors.com/</A> I think they run about $2500. Hope you've got deep pockets.

It would probably be a lot cheaper to switch to a 700R4 trans that already has an overdrive built in. There not as strong as the TH 400 but if you're not going to hook a high hp big block to it you'll be OK.

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[ November 12, 2002: Message edited by: Centerline ]</p>
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Old 11-13-2002, 02:13 AM
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Is there any other choice than Gear venders? I have been awhare of them but they're out of the price range.
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Old 11-13-2002, 05:50 AM
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Isn't a 700r4 basically a 400 with an overdrive? That's what I'm putting in my son's '73 Monte Carlo. Hopefully, he'll be ablt to get at least an extra 3-5 mpg over the 12 mpg he's getting now.
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Old 11-13-2002, 06:06 AM
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I hear all kinds of different stories about the new OD transmissions. My opinion, and it is just that, an opinion, is that they are great machines but must be treated properly. For example, ALWAYS take them out of over drive when under heavy load such as pulling a trailer or pulling a steep hill in a heavy car. If you don't, they will overheat and life will be drastically shortened. Also, gone are the days of setting shift points with the throttle cable 'by ear'; they must be set very carefully with a pressure gauge and LEFT ALONE! That being said, I think they are up to anything you would throw at a TH350 or TH400 with the added benefit of built in overdrive. An endorsement is that Summit and Jegs advertise them for all-out competition applications.

Here is my standard advice to posts on GM OD trandmissions - contact

<a href="http://www.bowtieoverdrives.com/" target="_blank">http://www.bowtieoverdrives.com/</a>
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Old 11-13-2002, 12:15 PM
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Thanks for the info it will help me make my decision.
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