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The Skyjacker rear block and U-bolt kit for 2011–2017 GMC Sierra 3500 HD 4WD adds rear lift and assists in correcting pinion angle to help prevent driveline vibration. Ductile iron blocks use fixed center pins and tapered faces, while U-bolts are e-coated for corrosion resistance. The kit includes mounting hardware appropriate for rear-lift installs and is supported by a limited lifetime warranty.
Skyjacker 2011-2017 GMC Sierra 3500 HD 4 Wheel Drive Suspension Block and U-Bolt Kit
