vibration problem!
I just installed a new tranny, and vig. converter in my 00c5. drove for a week, then went to the track a week ago. made 3 passes total. second pass when I was slowing for the return lane, I heard a noise like a swishing noise from under the car by the shifter I think? Now when I drive normal there is a slight vibration above 55 to about 75. but when accelerating 2/3 throttle, It vibrates the seat,floor pretty good. If I hit it full throttle, is goes away?
I checked the converter bolts again, balancer bolt, changed d.r. to street tires. So far, 3 poeple have told me to take torque tube apart and check the couplers and center support. any other input the same, or other things to check.
thanks Nuzz