I have a really bad vibration when I hit 75 mph and goes away at 85 mph, could this be caused by my aluminum driveshaft? the shifter vibrates really bad!
I had a similar issue where mine would vibrate at 50 mph to 60 mph. Turned out I had lost a weight on one of the tires. Went away after having them balanced.
your shifter vibrates really bad? thats sounds like a driveshaft but aluminum drivshafts are the prone to vibration. you could have damaged u-joints. have you checked those?