I have a 99 with the e-locker (find this if you can) and it has been a terrific truck across the board. Frame rot was an issue with the Tacoma since they were made in the USA. 4Runners of that vintage are made in Japan did not have the same frame issues. That said, in the Northeast, you will get a bunch of surface rust on the frame that should be touched up over time. Some other thoughts:
- 1999 was the most "lifted" from the factory. Almost 2" total over that later 3rd gens. I am biased, but a 99 w/ e-locker is THE 4Runner to get.
- I have 110K miles on mine. I have replaced: brakes, exhaust, shocks, timing belt, radiator and fan clutch. Only the fan clutch (easy repair and a $100 part) and the radiator fall outside what I would consider to be normal maintenance.
- The radiator sprung a leak into the part of the radiator that cools the tranny and mixed coolant with with tranny fluid. Unusual, but not unheard of. I shut it right down, flushed the tranny and all was good. replaced radiator and installed a $50 remote tranny cooler. Problem solved.
- The rear seat heater pipes are known to corrode after 6-7 years. Easy fix, but you should do it before it fails since it can strand you. I just bypassed the rear heater. 15 minute free repair.
- I also had a blower on the truck for 50,000 miles with no ill effects. It is no longer on it, but it was awesome.
- The truck gets 17-22mpg, runs regular gas and does not burn oil. I regulalry see folks in the forum with 200K+ miles on the 3.4. It is truly bulletproof.
- The car is tight, rattle free and still rides nicely.
- Replace shocks with Bilsteins and you will never replace them again. Stockers are only good for about 50k miles.
BTW, I beat the living crap out of my truck at the Fall gathering a couple weeks ago. It did beautifully while keeping up with much more built, lifted and locked vehicles.
Hope this helps.