torsion bar suspension

[chvtrkman]

A true novice here...I have changed coil springs before on older vehicles,but I am not familiar at all with the front suspension on my '02 Suburban.
Here's the issue... I'm replacing front brakes (rotors and pads)...did the right side yesterday,everything was really tight..had a bear of a job breaking loose the torx screws that hold calipers on,and the 18mm bolts that hold the brake pad carriers (don't know what they're called)..today I went out to do the left side...as things typically go for me, I got the torx out fairly easy, as did the lower 18mm bolt, but the top one near the upper a-arm and brake hose wouldn't budge..went thru half a can of PB blaster, air wrench wouldnt break it loose.. smacked the heck out of my breaker bar and all I managed to do is round off the bolt.I want to disconnect the spindle from the upper a-arm so I'll have better access to grind off what's left of the bolt head and use an easy out.
So, my question is: What kind of tension is the torsion bar under? I don't want to injure myself when loosening the ball joint.