03 t56 into 97 ??'s

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well the car has a 3.73 gear and 600 ft pnds of torque
I ran 11.99 at 120mph with a 1.8 60ft on the stock tranny at only 12psi
and I don't know how well the stock tranny is going to hold on

I already have the T56

is the spline on my 97 gt drive shaft the same the same?