Robin,

I understand that the 3.2L engine for 1993 was not used in the 4Matics because of the increased torque placed on the 4 wheel drive system. (So I have been told.)

The clunking, is when the vehicle shifts over from 4 wheel drive to rear wheel drive at 12 mph. (The car automatically starts out in 4 wheel drive up to that speed, then shifts back to the rear wheels, absent slippage. MBZ told me this is normal for the system, and only occurs when accelerating from a dead stop to 12 mph, not decelerating.)

I'm also interested in a "how to" fluid change for the 4Matic. Can anyone provide instructions?

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'94 E500 Anthracite
'92 300E 4Matic (donated to charity)
'90 300TE 4Matic