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The Skyjacker suspension block and U-bolt kit for 1999–2005 GMC Sierra 1500 4WD provides a 3.5‑inch rear lift and helps correct pinion angle to reduce driveline vibration. The kit combines tapered ductile‑iron blocks with fixed center pins and e‑coated U‑bolts for corrosion resistance. U‑bolts are offered in different shapes and lengths to fit axle setups, and the kit includes a limited lifetime warranty.
Skyjacker 1999-2005 GMC Sierra 1500 4 Wheel Drive Suspension Block and U-Bolt Kit
