Be very aware that new bearings in the rear diff rarely fix the whine. The whine most often comes from the ring and pinion gears, not the bearings. The bearings might be bad, but the whine typically comes from the gears, which are usually well over $900 to buy from MB. If the whine can be made to come and go when it is whining by feathering the accelerator back and forth, the whine is almost always in the gear assembly, not the bearings. I had my rear diff rebuilt and the diff is great now, still has a whine though, not much, but still there.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red