C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Feb 5, 2015 | 10:38 PM
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hey gentlemen, I was wondering if anyone has swapped the original 4 speed trans for a new 6 speed trans from power train in a late model vette. I have a 73 that I was thinking about trading out one. any thoughts or opinion thanks scott
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Old Feb 5, 2015 | 11:26 PM
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If you are thinking about a C5 or C6 six speed, it is a trans-axle and not really suited to a C3. A Camaro/Firebird, GTO, or Cadillac 6 speed would be a better swap, and it has been done many times. You could also look at aftermarket 5 & 6 speed transmissions.
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Old Feb 6, 2015 | 06:34 PM
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If using a used GM six speed...the ZF design. Just be aware that if you do not use a dual mass flywheel...which is no longer being made...you will have noise coming out of the transmission due to not having the bushing in the flywheel as GM intended to stop this noise.

DUB
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Old Feb 6, 2015 | 06:57 PM
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I have an 06 GTO T56 6 speed in mine. It takes some work to get it in there but it is well worth it. Go for the T56 6 speed. Pricey but worth it.
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Old Feb 6, 2015 | 09:54 PM
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im installing one right now, in a 69 vette.I cut the center section of the trans crossmember out, then will make it a bolt on .then got a quick time bell housing with a new t56 magnum 266 first gear, which will work great with my 370 rear gear.So far I just have every thing torn apart.After i get transmission installed, I will fab up my side pipe headers to fit.
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Old Feb 6, 2015 | 09:56 PM
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oh ya make it easy and remove your seats and center council, you will have to cut a hole in your trans tunnel, and get an off set shifter, just google it and there are alot of write ups on it.
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