I just got my 2002 chevy ext cab 4x4 5.3 liter with 60,000 miles what are some good things to go over. I'm going to check transfer case oil rearend and frontend oil, trannyoil, Just wondering if there's any damage prone things i should check. The WOT shift from first to second seemed like it almost made a grinding noise, and possibly was slipping a little too much. I might take it in and have it flushed any ideas.