Re: Well, the Chevelle is D.O.A.....
The diameter of the shaft was the issue. The 3" shaft went past it's "critical speed" which is the point where the shaft begins to "jump rope" in the middle. What threw me off was I was experiencing vibration several hundred rpm lower than the critical speed chart says it should've been.
Since there isn't room for a 3 1/2"+ steel or aluminum shaft, I guess I'll have to bite the bullet and go carbon fiber.
It's that or put everything back to stock, sell the car and go from there.
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