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Got another thought for your too. What about have a tranny built for your application. I think that if you had spent the money to have one tranny rebuilt with new bearings etc then you may not have had as many problems. You also don't talk about other things which are just as important, what driveshaft are you using, how old is it? when you went to the turbo tranny in a NA chassis did you also replace the rear end if not who built your driveshaft and what RPM and balance spec did they use? Another thing you didn't mention, you talk of engine vibration but what motor mounts are you using, what tranny mount and what about the rear end mount as well. Used/worn out rubber ones will then put something in the drivetrain in a bind usually the tranny or driveshaft. I have plenty of "good used take out trannys" that I know absolutely nothing about car looked good, looked like it was taken care of but the motor was blown..... hmmm its really easy to say it ran fine when it was put away. Another problem we have seen is that trannys stored on their noses for a long time with little or no oil tend to corrode the gear sets and internals due to natural condensation and water getting in the tranny. I have esp seen this problem with JDM engines/trannys. It isn't a great crisis but enough to shorten the life esp when used heavy. You mention drag racing so I am going to say it, how many times have you missed a shift or speed shifted or power shifted, don't bother to deny it I race to and have a passel of trannys to prove it. Using a used stock tranny for racing application I expect to lose one about every 6 months just a fact of life If I don't want to do that I need to upgrade and then something else will break that is how the system works.
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