Install the extended brake lines first. Then remove the rear shocks and try installing the rear springs w/o the spring compressor. You might be able to drop one side of the axle low enough to install the spring. Please be very careful when working on your truck (make sure you have a good set of jackstands and your truck is secure). If you can ramp your truck on a rock that would be easy to install the rear springs one at a time. My truck flexes enough that I can change any of my springs w/o a spring compressor.Badger said:
Good luck.