I know this is an old thread, but I just adjusted the torsion bar on my 2000 Ford F150 ext cab 4WD. It was also riding about 1.25" low on the drivers side and was noticeable. Looking under at the adjuster bolt it was clear it wasn't matching the passenger side bolt. The drivers side bolt had about .25" more threads exposed on the bottom.

I jacked up the front by placing the floor jack on the frame just behind the front wheel to get it off the ground and take most of the preload off the torsion bar. This made the bolt much easier to turn. I lubed up the bolt with a little PB blaster and used a 1/2" breaker bar and an 18mm socket. It actually moved pretty easy. The bolt had to be tightened a little more than the passenger side to get the sides to even out (about 1/8"-3/16 more). That took a couple of trys at getting the height close. It's still about .25" low, but I'm going to drive it a little to and check it again in a few days. It looks much better now.