Ths shock won't affect the height. It would affect the quality of the ride, but not the height.
Yes, the t-bars only affect the front ride height.
Off the top of my head, in addition to the possibilty of the t-bar weakening (although if the left side is higher, it would be the right side t-bar that is weakening) these could be possibilties:
Are you measuring with the vehicle parked on flat ground?
When you cranked the t-bars before, was something heavy (or someone) in the X on the drivers side?
The T-bar adjuster bolt could be slipping. I'd check to make sure both the locking and adjuster nuts are still on the adjuster bolt. If the locking nut somehow loosened, the adjuster bolt could lossen causing the right side to appear to sag.
How much did you crank the t-bars? I'm wondering if there is a possibility that you cranked the t-bars until the UCAs were contacting the bumptops, and are missing a bumpstop on the left side - if that is the case, then that might also account for a ride height difference.
Do you wheel your X? Check the torsion bar for scrapes and any visible surface rust. If there is surface rust on the T-bar, then there is a possibilty of rust entrusion into the T-bar causign failure - the sagging could be an indicator of that.
Any one of these, or any combination of them, could be a reason for the height difference.
_________________________
Jeffrey
I'm just trying to put my tires on the rocks of life.