Hi experts! As stated in the title, I'm getting a vibration in my rear end (ostensibly) that ONLY occurs when under very light load and at certain RPMs. I have no idea what is going on and when I am either not on the throttle or on it heavily there is no vibration.

To elaborate; the vibration feels like when you are in a car with 2 15" subwoofers in the trunk and it its a long low beat that rattles the trunk. I have a G35X 2008 with 75k miles on it. Any input is welcome!!!!

Thanks,

Chris

 

wheel bearings? Dragging brake calipers? Diff bush? Other suspension bushes? Wheel balance?

Just throwing some ideas out. Have a look underneath for anything obvious.

 

Thanks for the advice! I can't see how it would be a wheel bearing since it only happens at a certain rpm though :/

 

Also Brad, Can you help me on how to check the diff/suspension bushes?

 

Signs of cracking on bushes usually mean they are going/gone. They could not be the real root of a problem but either way they need changing. One of our cars had a vibration at highway speeds and seemed to vary with load, fresh bushes reduced the vibration by like 90%.

Start simple though, check the balance of the wheels