The 99 Highlander Springs
If you want a small lift or have worn out springs, a good option might be to change out your springs for springs from the 1999 4Runner Highlander Edition. these springs sat 1" higher than any other 3rd Gen 4Runner. They can be ordered online or at a Toyota dealer.
99 spring part numbers:
Front Passenger Side Springs - Blue / Yellow (48131-35400)
Front Driver Side Springs - Blue / Pink (48131 - 35350)
Both Rear Springs - Yellow / Red (48231 - 35210)
Pros: Fairly inexpensive, OEM ride quality.
Cons: Small amount of lift. (might be all you want)