putting a t56 in my 1974 455

[kev 190164]

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   

[nUcLeArEnVoY]

For what I've researched on the fly in response to this question, a lot of people are just using a stock-style flywheel.

[5th T/A]

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.

[70_71_78]

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. 

[71455formula]

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

[kev 190164]

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