when i have my transmission perform button on after a few runs it hits redline like 3 times before it shift 1-2 is this normal... my rear end use to whine when i went around sharp corners now it clunks and grinds and i feel the car bumping up and down around slow sharp corners.. what is this thanks jeff

 

check your fluid in your rear end if recently changed make sure you added the limited slip addative.

 

I too would like an answer on the 1-2 shift beyond redline. I started experiencing this ever since I had the transmission flushed. 2-3 is perfect.

 

with my perform button off my car shifts perfect i think the factory just increased redline a bit... i checked the differential last weekl we put new fluid and limited slip addative in it.. it could be my posi unit i guess