[FrankieT/A]

If the vibration is in the driveshaft you would certainly feel it in the shifter, resting your hand on it. If you don't feel it when you push the clutch in that would lead me to believe it is tire related, possible rear axle. If it's your driveshaft angle is off you either feel it while you bear on the gas lightly or letting off. As for tires, You can balance an egg but you can't make it round. Tire runout needs to less than .045 of and inch according to GoodYear. Most tires exceed this. Better Goodyear stores actually have a micrometer on a stand to measure run out. Any Goodyear tire can be adjusted if not within this tolerance. I was tired of ride disturbance myself, so my procedure was this: the first thing I did was get together about 10 rally II wheels with no tires on them. I brought them to my friends shop and put them on the tire balancer, spun them by hand and picked the four straightest wheels. Next went to the tire store, bought four tires and had them mounted. Had them spin them by hand looking for straightness and concentricity on their balancer. It took 6 tires to get four good ones. Then I took them to a place that did road force balancing and had them balanced there. It was all a pain in the neck but my car is smooth as glass up to a buck twenty. Sorry to be long winded. Just trying to help.