Bump

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

Are you talking about the joint referenced in link below?
124 Supporting Joints and rear shocks

Yes, that's it. Upon reading posts it seems as if the 150k mile mark is the norm to have them replaced. I have over 230k miles on my car so it's time.

I must add that it's only the drivers side that makes the noise, several years ago I was t-boned right at the rear wheel and never had it looked at since it drove fine, and still does. The squeak only developed 6 months ago and has slowly got worse as time has gone on, now it squeaks all the time, but still drives very well. I doubt that the accident has anything to do with it but it might add some work.

I might just redo the whole rear end since I'll already have the suspension apart.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

Tool is Sir Tools M0085.

Look at the diagram in the link I posted.

As I recall I supported car on jackstands. Then support the end of part #6 with a floor jack. Remove nut and bolt 6e and 6f. I believe I removed the bottom bolt for the shock absorber too. Slowly and in a controlled manner lower the end with the jackstand to take the pressure of the coil spring. Remove and replace supporting joint with special tool.

Job is not technically difficult. You do not have to take the whole rear suspension apart just to change these supporting joints.

Good to hear, looks like I'll be able to tackle this with ease.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500