Owned since new. Awesome power and it manhandle's my 7,500 pound travel trailer. Smooth riding for a 3/4 ton truck and sticks to the road like glue. Smooth shifting tranny, not the clunky type in some of the other GM products. This BLOWS away Fords and Doge Ram . Toyota or the rest of Toy trucks need not apply for the job. Easily swallows and carries 30 sheets of half inch drywall 4x8. Then switchs back to a family carrier. Most dependable set of wheels ever. I would buy another in a heartbeat but not with the wimp like 5.3 liter engine. Even with the 4:10 rear it won't tow well on the long hills.
Number one is the smooth shifting tranny. Number two is the 8.1 liter engine has more torque and gets better milage than the 6 liter. Number 3 is the changeover for your dollar.
Some times the way the plastic parts join in extreme cold temps (interior) they make noise. Stock Mud-flaps.