Ok as stated above I obviously have some serious sag or bad bushings. Where do I start looking for slop? How do I check for slop and what bushings should I check ? Considering the age of the car should I just consider replacing all of the bushings? I havent even had a chance to take the back tires off and check it out. It looks the the "trailing arms" lower mounted bars that connect to the frame forward of the rear end were replaced(new parts tag still visible)
I did a search but didnt really find an answer I need more titorial on these rear ends and a lesson on checking them.
Thanks for all your help and replies
Bill

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2009 Chevrolet Duramax/ Allison 2500 HD
2009 Chevrolet Duramax/ Allison 3500 HD
2007.5 GMC 2500 HD Sierra
2007 GMC 5500 Duramax Allison
2) 1998 Chevy 6.5L Diesel 3500
1993 VW Cabriolet 1.8 Classic
1987 Mercedes 300 3.0 D (4 door sedan)
1986 GMC Brigadier CAT 3208 NA
1982 Chevy 6.2L Diesel Stepside