I have a 2000 z71 1500, bought it in 03 with 60k on it. It now has 225,000 and i am handing it down to my son who was 2 when I bought it. I have replaced the transmission like others have said, a fuel pump, water pump, 2 alternators, front bearings around 90k and just recently again and just recently replaced the rear end that went out. Instrument cluster has been fine. It has the hot air thing that blows even when on cold intermittently and the door lock quit working but it is probably an easy fix. The engine is pretty bulletproof and has plenty of get up and go.