2 problems
second one could be a few things. when i put it in 5th or 6th gear going about 65 my car starts to shake, not just slight vibration but like, the shifter is shaking back and forth. at first i thought driveshaft, but then after i got my carfax i realized the rear end had been replaced by the first owner, maybe that has somehting to do with it?
all help/insite would be greatly appreciated

