I have a 99 2 door zr2 blazer and I recently replaced my two rear rotors. The ground I was working on was a little more unstable than I thought, and after putting the tire back on on the rear passenger side and releasing the jack the weight of the vehicle shifted and caused the jack stand on the driver side to tilt and the blazer came down on the driver side rear rotor. Now my driver side rear tire happened to be between my rear bumper and the ground, and caught most of the weight I feel but the rotor still had some pressure on it. After getting it back up and putting the tire back on I drove to town and noticed that while accelerating in 2nd and 3rd gear I have a very prominent Vibration in my whole car. Now when I'm coasting in neutral the Vibration is completely gone at any speed, it seems to only be present while accelerating in second a nd third. I changed out the rotor that it fell on with a brand new one under warranty but the vibration is still there. My only guess is maybe I damaged my rear axle or differential somehow?

 

Put that wheel up front driverside and if the vibrations change u may have bent the wheel

 

I was told the same, but if it was the wheel then the vibration would occur while coasting as well, there is no viration what so ever while coasting, only while accelerating in 3rd 4th and 5th, [30 mph and above]