congrats,on 400,000 you must drive it alot, i have a '97 4.6l with only 140,000 and its giving me fits! every problem on the forum i believe my truck has experienced .right now it is idling very rough at start up and i'm thinking the fuel pump is going out because it want crank sometimes after driving for about an hour .had to have it towed on father's day from the lake because it failed to start after unloading it from the rollback it fired right up.i'd like to brag on it but the only good thing i can say about it is it's paid for

 

Yes, congratulations. I'd like to see the compression readings on that engine, oil pressure to. You must use thinner oil in the winter right? 5W20 - 5W30? Other wise that 10W-40 would starve the valvetrain.

How often do you check and top off your oil? The 99's and earlier had valve stem seal problems wearing out early and causing the engines to burn more oil.

What do you do, drive back and forth on a looooooooooooong flat road to the grocery store for a loaf of bread every day.

 

All 4 doors on my 99 are rusted out at the bottom, the bed has two 5 inch diameter holes on each side just ahead of the rear bumper, the frame has a 2 inch hole just under the drivers area, and the left rocker panel has rusted through at the end near the bed. What does your truck look like in these places after 400k+?! Awesome.

 

My 2003 F150 4X4 hit 340,000 ...but it's on engine #2. But still it has done me very good. 340K and my cruise works..a/c works...cd player works...every light works...awesome vehicle