Today, the 1982 300sd got a new differential mount, new springs and spring pads, new shocks, and new sub frame bushings.

Coming home from the shop, I heard a distinct roaring noise that was not there before coming from the rear end. It sounds like metal on metal or a wheel bearring going bad but not quite the same.

It increases loudness with increase in speed. It decreases loudness with decrease in speed. It really starts about 30mph. Checked differential fluid, it is full. Mechanic put it back on rack and rechecked everything, even ran it in gear off ground, but it does not make noise off ground. He rode with me and heard it, but we cannot diagnose. Please help.

Ride height was restored. It was an inch and a half low. I measured before and after rebuild. The springs, spring pads, shocks, subframe bushings and differential mount brought the car up an inch and a half in the rear. And car does not lean in corners any more. I am going to crawl under right now and see if something is rubbing while car is on ground. Did all repairs change rear end geometry that much???

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup