Replaced leaf springs with 1 & 1/4 ton springs at 79,000 miles original ones broke (due to me overloading).
Exhaust manifolds and y-pipe cracked at 143,000 and again at 220,000 miles.
Exhaust pipes from the cat converter back rust out every three years.
Fuel tank, sending unit, fuel lines, oil cooler lines and brake lines were all replaced at 192,000 miles due to rust.
Radiator leaked and was replaced at 171,000 miles.
EGR valve rusted out and failed at 175,000 miles.
Left front wheel bearing failed at 221,000 miles. Replaced tie rod ends, ball joints, pitman and idler arm at the time to cure loose steering.
4WD actuator failed at 230,000 miles.
Cab mount bushings were replaced at 250,000 miles.
Water pump failed at 299,000 miles.
Power steering pump failed at 312,000 miles.
I have replaced the brakes, tires, alternator, starter and battery and you joints a few times since I bought the truck, but that just is regular maintenance. I replace the tune up items (plugs/wires/cap/rotor) regularly as well.
This has been a fantastic truck. I bought it to replace my 1988 K2500 that lasted to 330,000 miles. This one will blow it away.
I plow with this truck in the winter, and tow 8000 pounds worth of livestock with it in the summer. I have a gooseneck hitch in the bed, and I have yet to hitch to a load I couldn't pull.
The truck handles the weight of the plow well, and rides very smooth on the highway. It also rides very well with loads of stone in the bed. I've had 2 tons worth in the bed of the truck before, and it drives fine.
I have never had the heads off the engine, or the transmission, or transfer case out of the truck. The rear axle is getting noisy, but has never been repaired.
The truck rides well when loaded, and okay when unladen. The seat is comfy, but the fabric wore out. A seat cover is a low buck fix for that. The AM radio sounded bad, so I had a AM/FM cd player and new speakers installed. Plenty of room in the cab.
My only complaint is that the 3 speed transmission and 4.10 axles make the engine rev high on the highway, but without those gears, I don't think the truck could leverage such heavy loads. I wish it had overdrive.
I've worked this truck hard, and on occasion I have had to abuse it, and it has NEVER let me down. Repairs are easy and parts are cheap. For a farmer struggling to make it, this is one of the best pieces of equipment I own.