Upgrade the suspension of your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax with a set of Coil Springs. In addition to increased load capacity, some coil springs provide a more aggressive appearance by elevating and leveling the front of your truck. For items like snowplows and winches, many of the springs available will raise your truck's load capability. Eibach and SuperSprings are just some of the top-quality brands you'll find.