There are three distinct noises coming from the drive shaft and/or differential area of my 1990 190E:

1.) A scraping sound when I first begin to depress or release the accelerator.

2.) When I let the car coast to a stop, starting at about 25 mph there is a whining or droaning sound that winds down with the speed of the car.

3.) From a standstill if I accelerate firmly to, say, 10 mph and then let off of the gas, there is a pause and then a loud clunking sound.

The only thing a dealer and a mechanic have found wrong is the front flex disc is worn. Could that be all or just part of the problem?

Thanks in advance!

Matt