Got 408k on my truck now. I ran factory 245 tires until 207k miles. At 207k, I bumped the tires up to 265s still on factory wheels. Been running 265s ever since.
At 235k miles my upper ball joints were absolute toast. That was the first front end work I did on this truck. They probably needed to be replaced a good while before I did.
254k lower idler arm and steering damper.
Replaced the front hubs at around 263k. Wasn't having any problems with them, just did it as a maintenance item.
Replaced the pitman arm at around 275k. It was also something I should have replaced sooner.
Then, at around 330k I did a serious rebuild. All 4 ball joints (was just going to do the lowers but decided that if I had all that crap tore apart I might as well do the upper BJs again). Did the upper BJs by way of new control arms with new bushings. All tie rod ends, and lower control arm bushings.
At 360k the left side hub started roaring - I had used NAPA's "super-duper" replacement hubs when I replaced them the first time. they were expensive as hell and didn't last half as long as the factory ones. Went Timken this time. Less than half the price.
At 386k I replaced the pitman again and top and bottom idler.
399,000 miles - the steering box started leaking from the output (sector shaft) seal. Replaced it with a Delco reman unit (I trust Delco reman stuff - my Delco alternator has been on the truck since ~220k miles.) After that, my steering is literally factory tight again.
407k miles - a few weeks ago I was getting the roaring from the front end again. Ordered another Timken hub and replaced the right side NAPA unit.
All the stuff I've installed has been Moog excepting the steering box and the hubs.
2002 Chevy 2500HD Crew - Original owner - 408,000 miles so far. All stock with the exception of a lift pump.