Get the Helper Springs you need for heavy hauling with your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax Available in multiple load capabilities, these spring packs install with u-bolts, or other hardware which secures it to the existing suspension components on your truck. Helper springs mount on top of the original leaf spring pack and work in conjunction with the factory leaf springs. The enhanced support to the original spring pack helps to provide the vehicle with added stability up to the stock GVWR. SuperSprings and Hellwig are just some of the manufacturers you can find to help you get the most out of the suspension in your truck.