Was having problems with rear end vibration so after much searching most people recommended swapping the cv axle cups, did that about a week ago and it improved a lot but the issue hasn't gone away completely. I used to get the vibration at any speed about 35-40 mph, now it only happens above 70 mph but its intermittent it will come and go and doesn't matter if I'm giving it throttle or not its still there if I let off the gas completely. Kinda hard to describe but the rear end doesn't feel as tight as it used to be either kinda loose in the turns at high speed.

Wheels balanced, tires brand new...if it was a bad tire or wheel issue I would think I could feel it at all speeds

Brakes and rotors only a few thousand miles on them...pretty sure I ruled out warped rotors

CV axle cups swapped...diff mounts aren't ripped or leaking

Any ideas what to do next? I'm pulling my hair out trying to figure this out and I don't know an honest mechanic or dealership around here to bring it to.

 

My car had a bent rim and it balanced fine. You can see the bend. I fixed the rim and fixed the vibration

They say you can balance anything but won't mean it will drive right

My vibration only happened at 75 and up

 

I seem to have similar issue. The vibration occurs around 72-73mph anything below or above its smooth.

Boyguan -- the bent rim was in the rear?

 

The tire place wouldn't have noticed if the rim was bent? Guess I'll check that not sure how it could've gotten bent I barely drove it all winter and this problem just came out of nowhere.

 

I have the exact same problem!

Lowered on Eibach, axle spacers and 18" OZ with new rear tyres...

Guess I'll have them checked for straightness.

 

Yep rear.

They saw a minor bend and told me. I have driven on bent rims before and no issues. I think it depends how bad it is