After almost 2 years of wondering what the hell this sound is and a complete front end rebuild, it turned out to be the guide rod mount on the driver's side. It turns out that a $13 GRM with bracket from the pick and pull is better than a brand new $66 Febi. I know that what I have on there isn't a long term solution, but I'm sick of throwing money at the front end of this car and was willing to do something as desperate as throw a junkyard suspension part on the car just to help pinpoint the problem.

Replacing a GRM on the W126 is pretty simple since the bracket drops down from the frame and then you just screw the mount off of the guide rod. I needed the spring compressor to take the load off of the LCA so that I could push it forward a little bit to line the bracket up with the two holes that it screws into.

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'81 300SD