They say that the shackle moves your axle forward. I have them on mine with no problems. I didn't measure or check anything before or after nor did I care to. Pat the truck looks great. Came a long way since the first time I talked to you and saw your truck. I've been neglecting mine so I need to get back to it. Whenever your free let me know and I'll drive up for a mini meet.

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Truck Specs: 2006 Sport 3.0 Tires/Wheels: 33x12.50x15 pro comp Suspension Mods: SL torsion bar crank, Full Leaf added re-arched, Chevy lowering shackles.Exterior Mods: Knight shaded tailsInterior Mods: Painted bezel and door panels. OHC blue also.Audio/Video Mods: 2 memphis 12's and memphis 1000 watt amp