I've got the same problem with my 99...But I'm thinking my frame is bent...
Take a look at this guy's experience...probably worst case, but there seems to be a known issue with this:
http://www.offroadingadventures.com/I have so much rust flaking off my frame, its hard to tell whether mine is buckled in that spot or not...I have to get under and try to measure it or something.
I also was hoping it was just the shock on that side, but when I replaced it with a new one, it didnt do anything for it.
Granted, I have had a semi-bad front end hit when I fell asleep at the wheel in a blizzard, and hit a huge pile plowed snow at the end of someone's driveway...And then there was the time I backed into a thin pine tree a little hard, on the left rear corner....AND the time I backed right into the front of my buddie's S10....AND then the time I backed up and JUST clipped the very corner of the left side of the bed while backing up next to an opent top dumpster..(Caught one of the hinge tabs on the corner of the dumpster and sliced open the bedside...)
And then the time I had a 650lb Cub Cadet in the bed for a day or two....And then the time I picked up a 7MGTE, tranny and all the goodies to go with it from Foxfab in Conn. (I'm 8hrs away in NY)...I left the motor in the bed for 4 days...I found out when I got back, the left AAL broke clean in half somewhere along this trip, too...
Anyway, I'm guessing it was one (or more) of these things, but probably hauling the motor and leaving it in the bed is what did it...Ever since the AAL broke, its been leaning...Even replacing the AAL hasnt helped...
Check out Demello Offroad...they have frame reinforcements...$89 for both sides.
http://www.demello-offroad.com//cat...;osCsid=2ad75d8619e7c19021097563c8a0eb49Looks like you scab them on the outside of the frame...I wish they were for boxing the inside of the frame, but I guess they work...I know they've sold quite a few of them...