mook99ta

iTrader: (3)

Got a bad vibration coming from the rear of my car the other day from like 80mph-110mph at least that is where I let off. I pulled my driveshaft and saw that two of the weights on the transmission side were missing. I brought it to a driveshaft shop today and they said that the weights missing is not the problem. I checked my rear and the backlash is good and no slack in my u-joints. Pulled the cover off my rear and everything looks fine, no metal shavings or anything. What do you guys think it is?

fuseone

take the drive shaft to another shop and get it balanced

Johnnystock

iTrader: (6)

Might sound stupid, but what about your rear tires? Sometimes you can get a bad vibration at the end of their life..

mook99ta

iTrader: (3)

got it balanced just gotta get some time to put it back on. I will let you know if that is what it was.

Sarge91

iTrader: (10)

was that it? I have the same problem

GMTECH4

for rear vibrations i like to jack up the rear and run it up until you feel the vibration. sometimes you can see whats causing the vibration. make sure you put the jack stands under the axle. then i like to start first by removing the wheels then run it up again, then rotors, remove them one at a time if vibration goes away then you have found your vibration. i have seen rotors out of balance. also keep in mind to that the pinion angle can cause a bad vibration also. if you have any good gm dealers around there is special vibration analyzer tool that can pin-point a vibration if they know how to use it

mook99ta

iTrader: (3)

Yes that was the problem after the DS being rebalanced and reinstalled the vibration is gone.