I put about 3 1/2-4 inches of lift on my Sammy.(2" shackle rev and OME springs) I put longer shocks,front bump stop extensions(came with SR), drop pitman, and extended the front sway bar hangers. I did not add drive shaft extensions or longer brake lines. When the springs are on, jack up the rig and support the frame allowing the springs droop. See if any problems are vi sable. That is brake lines too short or excess drive line spline showing. I would rather see a little spline show( as long as not too much) than for it to jam on compression.