Love mine. It's a 2001 quad cab 4x4 automatic w/ 190k on it. When I bought it it had 160k on it. An old man had it and pulled a camper w/ it.

If the truck you're looking at has an aftermarket lift pump on it, that's good. If it doesn't have one, you'll need to put one on it...as well as a fuel pressure gauge.
I have the Raptor lift pump kit on mine...do not get one of these, lol.

By now the front end has probably already been rebuilt. If it hasn't, it's surely worn out. It'll wander all over the road, but it can be fixed.
New ball joints, track bar, and one of those steering box stabilizer bars made a huge difference.
http://www.thoroughbreddiesel.com/sinister/steering-stabilizer.htm

I'm no help if it's a manual trans, but the automatics are fairly weak. I'm almost certain my truck has a re-man trans in it.

Parts for these trucks are WAY cheaper than the later model stuff.

If you like mud tires, you can fit 35s on them w/o doing anything else to it.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax