Thanks for the info, Jen. The vibrartion on mine is at around same speed as yours, 62 - 68 mph, and I too try to keep it above or below that because it is starting to bug me.
I have only had this seriously investigated once and my mechanic was convenced it was the wheels/tires. They "broke down" the wheels, spun them all without tires and then again with tires and off-set any "rises." Then they spun them all again with a machine that applies about 700 lbs of load on them at the same time and adjusted acordingly. This helped for a while but, obviously, the problem has returned.
He stated he has had experiences where the harmonic balancer was the culprit, but ruled it out in my case. He also inspected the driveshaft for any dings/dents, loose universal joints, etc. and felt it was ok as well.
My next step at this point is to have him concentrate on the trans. and U-joint angles, the U-joints themselves, and faulty/loose trans. cross-member and bolts. With the holiday's coming on I don't know when that will be but I will keep you posted.
later, Kelly
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KMM
'97 GT coupe; K&N, 3:73's, steeda tri-ax, Mac catted H, Mac flow-path cat-back, aluminum driveshaft, white face guages
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