So for over a month now my car has this rotational LOUD 'thumping' noise coming from the rear whenever I hit 45 mph or more and is in sync with the speed of the car.. and sometimes it completely vanishes. If it is not doing it, I can take the car up to 70 mph and it will get it to start and it will continue if I slow down or speed up. The sensation cannot be felt in the steering wheel, and barely in the drive train, but I can feel it a lot if I put my hand on the roof of the car towards the hatch and it gets my trunk latch creakin away too. Almost sounds like a tire is completely out of balance in the rear, but they're not. Weird.

E Brake has been adjusted several times and calipers have been checked. Rotors are wearing normally. Axles are tight. Solid diff bushings were installed in November. Also put Blizzaks on stock wheels, but didn't start having these symptoms right away. If anyone has any recommendations, it'd be appreciated as I'm completey stumped! HELP

 

check the nut that holds the wheel hub on

 

Do you hear a squeaking sound too?

If so you have the same problem as me. I have no clue what it is but I'm digging into it this weekend.

My guess is it's the hub, cv shaft or u joint in the driveshaft.

Just gotta get it jacked up, shake it down and find the culprit.