I have a clunking sound coming from back of car when going over rough surface. Got under car and checked everthing. seems tight. could it be a bad shock? It clunks as suspension moves up and down. 60,000 miles on car. original bilstien shocks. Z51 suspension. Thanks for any info Dave

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Sometime the nuts on top of the rear shocks can work loose check those first before you dig any deeper. When I replaced my shocks the rear tops were just a little more than finger tight.