Hello everybody.

Recently I've bought a ML430 (W163, 1999, 143000.km) but it makes a strange sound when slowly moving forward or reverse (up to 0-10 mph)
I'd describe the noise as if somebody put a few marbles into the driveshaft (tumbling sound)

I have checked underneath the car, but everything seems OK. If the car is on the hoist (wheels off the ground) there is no sound whatsoever. The noise stops as soon as the car reach the speed of about 10 mph or more.

There are no vibration at all, transfer case, front and rear differentials are filled with good quality oil/fluid.

Any help/advise/suggestion appreciated.

Cheers,
Mick