I have a 94 K2500 8 lug 6.5 LTD. I had the VIN checked and it came factory with green keys installed. The dealer lists Blue, white, green, and orange keys, will any of these lift my truck, or do I need to change torsion bars to get more lift. Currently the truck rides "factory low" and my torsion keys don't have much adjustment left in them. Any ideas that don't cost a small fortune?