i have the same clunking sound in my 88 260E. I put it up on the ramps today and am certain that it is the front flex disc. I ordered one today, but I haven't the slightest clue how to install it. If you are trying to diagnose it, put the car on a lift or ramps and move the drive shaft back and forth with your hand. If the shaft moves, but the disc doesn't, then that is the problem. Anyone have any ideas on how to install it?

Matt

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1988 260E