I have a 96 G 463 in the US. As long as I have owned the car (4 months) there has been a rattle in the rear of the car when going over a bump.
It is most noticeable when the right rear wheel hits a short dip in the pavement.

So far I have replaced the rear shocks, disassembled the right rear brake drum, checked for any looseness in the exhaust system including the crossover pipe.
I have removed the shield on the gas tank and checked for loose components. I have replaced the linkage arm of the ALB unit. I have attempted to tighten the bolts and nuts underneath the car but have found no loose or worn bushings.

So far nothing I, or a mechanic have done has helped to diagnose the rattle. It sounds similar as to when one tows a trailer and the coupling is moving on the hitch while travelling on rough roads.

Any help in diagnosing the fault would be greatly appreciated.

Pete

Pete, there are two bolts that attach the rigid arm of the axle to the frame. Two at each axle end. They are pretty hefty. I had similiar symptoms, called Europa and they recommended that I use a breaker bar and tighten those nuts on the bolts as tight I could. THey said over time some looseness will develop that permits a "slip" = "pop" under load. I did it and it's been okay since.