I bought this truck with 93,000 miles on it 10 years ago. It has served me well. When truck was lost in an accident, it had 161,000 miles. Never had a major mechanical failure. Biggest issue I had was Truck Body Controller, located under driver's, seat causing some quirks with interior lights, seat position memory, and battery drainage. That was probably a result of failed cab vents that were leaking and soaking carpet. The 4WD with locking rear was awesome! The engine was great. I towed quite a bit. It was rated at 7700 lb and frequently towed/hauled 5500 lbs up and down hills. Would have been nice to have the newer 6 sp transmission. No real complaints about this truck.
bought brand new in 2004. at 45,000 miles the gauge cluster went, @ 88,000 miles the catalytic converter went, @ 7 years old the cab corners and rocker panels started to bubble despite always washing and hand waxing, along with car washes. At 110k I was using coolant and heard my lifters ticking. With no warranty I pulled the valve covers only to find anti-freeze and my cylinder heads covered in muck!!! The warped cylinder heads that caused the disaster were on millions of gm vehicles between 2002 and 2006. Cadillac's, yukons, sierras, etc, A local mechanic with gm explained that they knew about the problem but continued to use the heads because they had purchased millions of dollars worth of them and knew the buyers would get 100k miles out of them. He explained a recall would have cost millions of dollars so they decided it was pretty much just cheaper to screw the buyer. 3k in parts and labor and the car was down for a week. Needed all new lifters and heads planed. @ 120k rust is through the cab corners and rocker panels. Won't pass inspection in NH, Large holes. Now at 146k It's using coolant again. I tasted the water dripping from the exhaust pipe. Sure enough, anti-freeze. Time to go. Bad luck with 3rd gmc in a row. I'm a bow tie guy with chevelles and other muscle but a ford 250 super duty is looking pretty good. Gas of course where as nothing beats a Dmax.
2004 GMC Sierra 1500 2dr Regular Cab Work Truck Rwd SB (4.3L 6cyl 5M)
bought the truck at 120k miles 4 years ago. today i have 205k on it as my daily driver to work and back (80mile round trip highway) and to the day all ive had to replace was an alternator. towed a boat for 3 years weighing aprox. 3800lbs with easy and stability. this truck is absolutely bullet proof and i would buy it again in a heart beat.
note: i also just bought a 2015 sierra all terrain edition last December and to be honest i like driving my 2004 sierra better! absolutely great all around truck!!!