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If it has the rear air suspension (Z95 I believe, or Z55), check to see if the air bladders still hold air and that the compressor runs 3 seconds after intial start of vebicle (or key on, engine off). Also, as those auto-ride shocks get old, the damping isn't as good and the ride gets clunky. Same goes for the front. Gone are the days where front struts would last 150k, the newer ones are pretty much worn out at 75k. The rears will last to over 100k if the air bladders don't crack and leak.