The Skyjacker suspension block and U-bolt kit for 1999–2006 GMC Sierra 1500 4WD provides a 2‑inch rear lift and helps correct pinion angle to reduce driveline vibration. It pairs tapered ductile‑iron blocks with fixed center pins and e‑coated U‑bolts for corrosion resistance. U‑bolts are available in various shapes and lengths to suit axle configurations, and the kit carries a limited lifetime warranty for added assurance.
Skyjacker Suspension Block and U-Bolt Kit 1999-2006 GMC Sierra 1500 4 Wheel Drive