My '88 240DL, 531,000 miles, TME Springs, HD Bils, full poly bushings, adjustable panhard rod, adjustable torque rods, upper and lower chassis braces. Corners like it's on rails, rides smooth, but I get vibration at 70-75 mph that rattles my rear view mirror.

Tailshaft bushing is tight, u-joints are not bound and were recently changed. Front wheel bearings are new, tires are good.

I have a driveline whine and the center bearing / bushing is OK. The whine will stop if I take my foot off the gas pedal and coast. The whine appears to be coming from the differential.

My plan is:

1. Remove the driveshaft and have it balanced.
2. Replace the rear wheel bearings - they are original and while up on the jackstands, there is a slight elipitical pattern in the center of the wheel during acceleration.
3. If 1 and 2 don't work, add an amp to my stereo system and crank it up enough to drown out the driveline whine..

anyone have other ideas?

Thanks for your time.....

'88 240DL - 531,000 original miles, original owner, original engine and second tranny.