The non-supercharged tranny is a 4t65e. The supercharged tranny is a 4t65e-HD "heavy duty". There is a gearing difference so the PCM will have to be reflashed. You can use your 4t65e torque converter on an HD trans. You will need a passenger side HD axle from a 2000 GTP. The HD trans has a larger differential and the axle is shorter then a non-HD trans.
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Last edited by HeavyChevy3800; Oct 23, 2009 at 05:39 AM.