So the secret is...not going over 60? :)
I LOVE mine, and it runs as good at 135,000 as it did at 31,000 when I got it.
It's nice balance of "old school" tech that you can still work on, and more modern high durability stuff. Mine is so easy/trouble free, I got one for my mom!
Actually it's an 03, quad cab 3.9, but it's been super dependable as well.