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I had my tranny swaped in my 69 mustang (T-5), but I have not idea which flywheel was installed during the exchange. I read the article in this website, and it says that if you install a newer 50 oz flywheel, that your engine will vibrate to death. Just how hard is this vibration? I have driven my mustang ever since, and it seems fine, but my mechanic does not remember which flywheel he installed, and I do not want to take down the tranny to check. Any way to quick check you guys?
 

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If all seems fine you don't have a problem.Believe me ,if you had the 50oz flywheel you'd know.They pretty much shake the whole car at anything above an idle..
A friend of mine learnt this the hard way.He started off with a flywheel with no weight,got another one but even after i warned him he got the 50oz.As they say 3rd time lucky.He got the 50oz rebalanced to 28oz and all was sweet..
 
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