Tedster,
See my reply a few lines up. You can do as you please when it comes to swapping 2WD and 4WD coils, but if you are seeking a better quality ride, and a bit of lift, swap in the coils that I did. Remember, my truck is a '01, which sits noticeably lower than the '99 version. I wanted it to be at the '99 height - thus the new springs. An added plus is that the new springs have an additional wind, which equals a bit more flex in daily situations. Coupled with the Bilsteins I've installed, the ride has improved tenfold.

If you were to swap in '99 2WD coils, you would probably be at about the same height. Not worth the money, and makes no sense. Find out if Bilstein lists the same shock numbers for 2WD and 4WD 4Runners. If so, you're set. Then you can get the '99 4WD coils and be done with it. Maybe email Bilstein directly, or contact Shox.com.

Andreas