2001-UP GM HD 5-8″ LIFT REAR 2.0 VS REMOTE RESEVOIR SHOCKPremium grade 5WT shock oil for consistent suspension damping along a wide temperature range100% rebuildable100% revalveableNitrogen charged monotube design with remote reservoirOne piece linear/digressive piston design with vehicle specific valving for unsurpassed performance and ride quality on and off-road5/8 chrome plated hardened steel shaft resists corrosion and pits6061 aluminum rod end, top cap, and internals ensure strength and durabilityPolyurethane bushings, zinc plated sleeves, and forged steel mounting stems for OE factory type fitmentApplication-specific reservoir mounting hardware6063 anodized aluminum body and reservoir tubing for superb heat dissipation, excellent corrosion resistance, and high-tech appearanceNitrile rubber top out bumper for noise free operation