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Message: <blockquote data-quote="white95" data-source="post: 345747" data-attributes="member: 10188">i know that vibration comes with the territory of owning a Mustang with aftermarket exhaust, lower gears, stiffer suspensions, etc.. I get this vibration that seems to come in waves [so to speak] at speeds of 70 mph or higher. dip the throttle and the vibration subsides somewhat but if i let off the throttle and slow down in gear the vibration worsens until i get around 60-65 mph. this is kinda annoying so ive taken these measures to kill it:A] installed an aluminum driveshaft B] rebuilt my rear end C] had my tires remounted and rebalancedD] changed harmonic balancerThe only other things I believe it could be is:1] i have bent fingers on my pressure plate, i go thru throwout bearings every 3 months... this problem will be addressed in the next few weeks, im swapping out motors, have new clutch/pressure plate..2] Ive been told that when i installed my tremec i should've had my driveshaft shortened 5/8" and theres some necessary modifications to the crossmember i also havent done. so the driveshaft must be in a bind? anyone know about the crossmember mods?3]the upper rear control arm bushings are shot, i have new ones to replace em4] I'm really out of ideas, my car is lowered 2", i have tubular upper and lowers, none of my exhaust is in contact with my body/chassis, already bent the tabs on the gas tank down to remedy that.</blockquote>