Huge vibrations at all speeds, Drive shaft wobbles please read & help :crybaby2:

[kennebellgt]

I installed urethane motor and transmission mounts, I used to get this vibration at 70+ mph but now I am getting them at ALL speeds its pretty severe, If you were to have change on the dash it would be bouncing around thats how bad it is, So i jacked up the car and ran it with the rear wheels off the ground and noticed my driver side rim is bent pretty bad, and the passanger rear is bent also but barely, also my tires are not balanced, and one more thing i noticed my drive shaft has a wobble to it when the car is in drive and the wheels are off the ground spinning, i tried to move the drive shaft up and down side to side and i tried to spin it to see if there is any play in the u-joints and they wouldn't budge, so i dont think my u-joints are bad, I think maybe installing the mounts make it more noticeable that there is a problem, the car does this even when coasting with the engine off, so what im asking is whats your opinion on what could be wrong and why the drive shaft would wobble like it does under load, thanks guys
:sad5: :crybaby2:

 

[x182dan]

dude get your tires balanced and if you have bent wheels and wheels that are not balanced that can cause serious vibrations. With that said I drove my mustang around for 6months with a bent rim on the drivers front. I was able to get it to balance out but it was def bent. I didn't notice any vibrations at all but when I stopped on the brakes I could feel it. However all four of my wheels were actually balanced even the bent one. I would start with getting all the wheels balanced.

 

[kennebellgt]

Okay thats the first thing i plan to do, thanks for the info, nice car you got there too

 

[94kingcbra]

+ 1 ^ and make sure your driveshaft bolts going to the pinion gear are tight. I noticed when I had a vibration at 70+ then it got worse and worse, which was because the bolts kept backing out more and more. I hope that this is your problem because it's a quick and easy fix. While you're there, inspect the driveshaft for any dents or fresh metal showing anywhere. If you find anything it might need to be balanced or replaced. Good Luck, Justin

 

[tommybunz]

check u joints easy fix and bolts