a833 OD vibration in 4th gear at 3000 rpm

Well problem solved, it turned out to be the drive shaft balance . The answer to drcharles question is i don't know how it was balanced but it looked like a long tire balancer. He did check it at 3000 rpm and said he moved one weight at the rear end of shaft but ithink he also added one. Either way it worked. Plus i sold the car today. I'm a happy camper!!!