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what is it?

  1. Working area
    Hi folks & Tech Exchange editor. I just bought a 2003 Chevy S10 Ext Cab 4.3l v6 Fleetside with 89k on it. I bought it to haul a small travel trailer (1000 lbs dry weight). Looking around underneath the rear end to check hitch & wiring options and saw the following. Wondering what two items are -...