Well first off, If it is 500HP, I would not even consider a 9" unless you really feel the need to donate some horsepower to the inefficiency of a 9" design. The days of having to put a 9" in any car making power are long gone. A 33 spline Tru Trac 12 bolt is much more efficient, and plenty strong (stronger then a 31 spline 9", and you do not want a 35 spline Detroit locker) and keeps your car all GM.
Give me a call, we sell a few Moser rears a week,. just took a order 10 minutes ago for a powder coated, 33 spline, Tru track going in a member of this forums car.
We have done 100s now Pro Touring cars, and can speck it out in no time
four zero seven 832 1752
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Frank Serafine
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