TAC Tech => Mechanical => Topic started by: kev 190164 on March 16, 2025, 10:38:46 AM
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hello can someone tell me which flywheel i need to put on my 1974 455 trans am . converting to manual and using a t56 magnum . is the engine internally or externally balanced
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For what I've researched on the fly in response to this question, a lot of people are just using a stock-style flywheel.
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I don't have an answer for you. Likely someone who sells Tremec upgrade kits could answer your question. A quick search turned up Modern Driveline. There are likely lots of options.
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As assembled from the factory they are balanced externally at the flywheel. However, they are not so far off as to require a severely off balance harmonic damper like a chevy small block 400. When I had my '70 455 built I had the option to select internal balance, requiring a neutral balanced flywheel. A factory flywheel was neutral balanced, but I am not sure I would use a factory cast iron flywheel and aluminum bell housing again for safety reasons.
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With my t56 swap. I used a Pontiac flywheel and clutch kit. My rotating assembly was internally balanced when i had it built, so I'm using a neutral balance flywheel. When you pull your trans out; you can look at the flywheel or flex plate to see if you need a neutral balance or external balance for your engine. Here's a link that has info on how to tell the difference.
https://butlerperformance.com/n-13498-internal-neutral-vs-external-stock-balance.html
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the 455 is all standard just want to fit the t56 . its an auto at the moment just want to know for sure if external or internal balanced . i have a duel clutch and a steel bellhousing