Tristen

My Mercedes 300D Turbo Diesel has been neglected for the past 20 years and I've picked it up from my father after it's been sitting for a while. However, along with the terrible shaking from the engine. The rust wholes in the floor board and the shock absorber bolts rusting out. A new problem has appeared. Under 15 mph the car runs smoothly. However as soon as you hit 15 and up. If you accelerate a knocking feeling and loud banging occurs. If you let off the gas it doesn't knock and only comes from the rear I can't figure your the problem

(Short version)
Loud knocking from rear during driving above 15mph, especially during acceleration. Any ideas?

vwnate1

Almost certainly a bad CV joint, look for new or rebuilt drive axles on E-Bay etc.

Look under the back of the car, if any of the rubber drive axle boots are ripped open, that's your problem .

muskratbenz

I had the same problem on my '83. Replacing transmission mount helped some, but the real problem was the driveshaft carrier bearing. It;'s an inexpensive part, but a PITA to replace - and to get centered. There are some excellent write up on this on some of the other forums.

vwnate1

When mine failed it only made a soft thumping sound when I eased off the accelerator, no loud noise at all in spite of about 13MM / 1/2" of side slop .

-Nate