My 2000 XLT was binding in slow speed, left turns(clicking/popping). I pulled fuse 104 and problem stopped. I noticed a slight change, smoother steering and acceleration. I am curious about just swapping the 3 position A4wd for a 4 position 2wdhi, out of a 97-98. I don't think Ford, re-engineered, the system , mid model year. I remember reading about roll overs, with underinflated Firestone tires. Mysteriously the 2wdhi feature was gone in 1999. Ford did not want soccer moms and bad drivers, losing control. That left everyone else stuck with Automatic 4 wheel drive. The 2003 model, returned the 2wdhi feature. The 99,2000,2001,2002 are only models, left without the 2wdhi option.