C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Jun 27, 2011 | 08:24 PM
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wondering if anyone has put an overdrive in there 1970's vette. what options are there, what kind of cost and how much work?

thanks
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Old Jun 27, 2011 | 08:42 PM
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Are you asking about an auto 4 speed OD, a 5 or 6 speed manual or the Gear vendors OD unit? Need more info.
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Old Jun 27, 2011 | 08:58 PM
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I put a 5 speed Tremec OD in mine and now have a T56 6 speed with 2 overdrives in it. Ihave installed many 5 speed ODs in difeerent Vettes. Which one would you like info on there are a bunch of options. Also automatic ODs are common.
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Old Jun 27, 2011 | 10:31 PM
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sorry wondering about the automatic overdrive any style.
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Old Jun 27, 2011 | 11:47 PM
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Gear Vendors will require alot of mods. Got one on my truck, but did not want to attempt on my Vette. You can do TH-200R4, 700r4, etc. Good luck!
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Old Jun 28, 2011 | 11:08 PM
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If you search you'll find a bunch of info on 700R4 swaps. If you search on my username you'll find a couple.
I'm currently considering a 5-speed manual swap. Seems to be a little more friendly on the wallet.
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Old Jun 29, 2011 | 06:45 AM
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If you don't have a lot of HP/torque, a nicely rebuilt 200-4R will swap with a THM-400 pretty easily. No driveshaft change, but I think you still need a saddle-type yoke for the transmission output (different journal diameter for the 400). The periperals (T.V. cable/bracket and tranny pan brackets) are also required and can be found in conversion kits from some of the tranny rebuilders.
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Old Jun 29, 2011 | 08:14 AM
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it the tremec 5 speed a drop in. That is, if you have a th400 already. Is there a need for an adapter between the bell and trans and will the same driveshaft work?

Found this one:
http://www.ddperformance.com/shop/in...p?cPath=107_89

Trying to decide between this and a 94 Ford T5
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Old Jun 29, 2011 | 09:59 AM
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The easiest/friendly one to install is the 200 4r, and you should be able to locate a core and rebuild it yourself....

Use a TRANS GO shift kit, no other.....you can find parts off ebay and even converters.....use a ten vane front pump, leave NO section of the tranny together, it must be taken down and cleaned completely....

total cost should be less than 600 bux.....

need a thm350 vette output yoke for the driveshaft you will not need to shorten or modify....the tranny tail shaft should set right on your cross support directly....use your present shifter setup....
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