I'm hearing a whop whop whop sound that turns into a vibration once up to speed and it seems to be coming from my rear diff.
I had the tires balanced, as the sound was as if 1 of the tires was out, or separated. They were all within spec,and rebalanced just for the heck of it.

So I jack up the rear and start spinning the tires by hand, sure enough the whop whop sound is coming from the rear, and makes the noise on both sides of the car.

Any suggestions? My dealer is 200 miles away, so I really don't have time to take it in at this point and it was just at the dealer 3 weeks ago for the brake judder fix.

I'm at my wits end with this car, as it has been problem after problem since I put the first 300 miles on it, what do they call it? "A Monday built car!"

 

If your in southern California, I've got two diffs I'm getting rid of.