the other thing it COULD be is the trans itself, we have had a car in here with an old t56 LS1 type, it would only vibrate in 5th and 6th, customer had the trans rebuilt and said it was MUCH better. seems a lot of the drive shaft over speed could be the cause??
Scott why are you using a 3.5" steel shaft? seems a bit over kill. and even if it is .083 wall DOM it will be really heavy. my 1000 hp drag car only uses a 3" steel shaft. on the cars that we have used aluminum shafts in the issue does not seem to be as apparent.
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