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IMO, I say let the tranny do the shifting, autos are set up to shift at the optimal speed and RPM, if you want better performance out of your Auto get a programmer or have it tuned by a tuner. From my understanding it is bad to manualy shift a auto unless it was set up to do so because you do not let it build the proper line pressure and could damage it in the long run, that is what I've read back in the 700R4 days but newer autos can be differant.
Also GM put TM in autos now that do not allow the full potential of your car. They put TM(Torque Management) in there to protect the drivetrain.
I haven't manually shifted a GTO before but yours sounds ok, its just that the tranny is pretty much going to shift it self when the time is right.
Last edited by gm4life : 10-21-2007 at 12:15 AM.
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