I know my car is almost 15 yrs old but its got alot of new stuff--motor-tranny etc. but this buzzing from the shifter area is killing me!! I have a T-5z with a Pro5.0 shifter and brand new tires the 3.55's are setup right--the cars has a vibration at part throttle at 60-70 mph. I swapped driveshafts and most of the buzzing is gone--but its still there and mainly in 5th on the highway---my console is tight. what else could it be?? The tranny mount??