A mechanic friend of mine told me that if the rear shocks squeak, you have to replace them. That could be part of your problem. Also, did you go back to the dealer and tell that they did not fix the problem?

Steve

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97 S500 Coupe 139Kmi.
92 300CE 150Kmi. Sold
89 F250 Diesel 220Kmi. Dead
98 GMC 1500 160K.