Put a new spring in. You can either use a compressor, or you may be able to disconnect the UCA, shock, and sway bar link on that side, and probably pop the axle side trackbar bolt, and you may be able to droop the axle enough to get a spring in.
I'd drop the whole axle and replace both sides from a matching set, though. If you get 4.0 coils you should get about 1-1 1/2" of lift in the front.