i dont see any problem with running longer shackles. easy and cheap way to level your ride. to be honest with you though id just make my own shackles it would be alot cheaper.
86 longbed pick-up, SAS with 83 front, 5 inch all pro, crossover steering, bilstiens, propane,bobbed,36inch iroks, EZ locker front,welded rear,exo, 5.29 diffs., 4.7 transfer case, dirty 30s.
86 4runner, stock, resto project?/DD
2002 dodge 2500 cummins 4x4, 6spd, 125hp inj, power puck, 5 inch exaust turbo back, B&W hitch, tow rig