I just finished installing the RC 3" lift with full leaf packs and LCA's. My driver's side sits a good 1/2" lower than the rear. Is this common with brand new springs? Or could something else affect it?

Are you saying the driver side sits lower than the passenger side? Or the front sits lower than the back?

But yeah, new springs take a little time to break in/settle down. If the rear is half an inch higher than front, it'll break in after some use and settle down a little and probably be perfectly even

Sorry, I had a special moment when I typed that. But yes, The drivers side sits lower than the passenger side. Not just the rear.

Are your coils on right? They should be seated down over the bucket exactly the same on each side.

Hmmmmmm I'll have to check that. But the front only sits about 3/16" lower than the other side. The rear sits 1/2" lower. That's what I'm most concerned about.

shackle angle look the same on both sides?
Only thing that I could think of is improper torque on teh shackles..but still, that really would be a long shot.

The shackle angle is pretty much the same. I torqued all the bolts with all the weight on the ground. I torqued all 6 bolts in the rear @ 109 ft/lbs. I think I may just wait to see if things even out.

Go jump it.
That may help