No they don't.
A C6 is the easest tranny to rebuild. Even a Caveman can do it.
Did you rebuild it?
Did you have a C6 manual?
Did you adjust the 2nd gear band? Screw it all the way in using a torque wrench set to 15 ft. lbs. then back it out EXACTLY 1-1/2 turns.
Do you have at least 23 inches of vacuum?
Was the VRV ever adjusted?
Did you replace the short vacuum hose on the modulator at the tranny?
Make sure the fluid level is up after running it when warm, might be low after filling the torque converter.
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