tire pressure?

j par said

"Slick shake"?!! I've only took 3 passes with the slick so far and I remember at the high end in 3rd gear it had a wild shake like the drive line was out of balance or something. I have to shift into 4th gear just before the finish line but the end of 3rd year seems a bit wild.

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What I'm referring to is when you get the air pressure too low and the back end of the car sways side to side. Not a vibration, but a feeling like the car is spinning on ice and about to loose control....its a bit of a white knuckle ride when that happens.

If you are having vibration issues at high speed, check drive shaft balance, tire balance, transmission mount (if it is bad, it would give the same vibration), etc.