2002 Blazer Squeakin me crazy

hey all got an 02 blazer 4x4 that was squeaking in the rear end over bumps etc, and under warranty, the dealer greased the crap outta everything, now out of
warranty, its squeakin again, and i shot everything i could see with white lithium spray grease and its still squeakin. anyone have any ideas as to where in particular to look? Thanks in advance for any help
Brian
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I believe there was a TSB addressing this issue, something to do with installing a sleeve on the rear springs to keep them from rubbing. Ian, am I right on this?
Doc

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