FOX 2.5 Performance Series HTO shock is a bolt-on shock loaded with position-sensitive technology, vehicle-specific valving, and larger pistons to improve on and off-road performance. A type II anodized aluminum body efficiently dissipates heat and prevents corrosion. The 2.5-inch shock body features an internal floating piston (IFP) to separate the shock oil from the high-pressure nitrogen, optimizing damping. Hydraulic Top Out (HTO) technology offers usable position-sensitive rebound damping control on and off the pavement. HTO reduces harsh top-outs and increases comfort by forcing shock oil through a secondary shim stack to slow down shock shaft speed; HTO is particularly beneficial after installing heavier, aggressive tires and applications lifted higher than OEM specification. Bolt-on 2.5 Performance Series HTO shocks to increase damping capacity and ride in comfort with position-sensitive rebound control. 2.5 Impact extruded 6061-T6 aluminum shock body Type II clear-anodized body plating High-flow velocity-sensitive damping 5/8 hard chrome shaft Internal floating piston (IFP) Hydraulic Top Out (HTO) piston Top Mount: Stem Bottom Mount: Eyelet Specs:0-1.5″ Shock:- Travel: 8.87- Extended Length: 24.7- Compressed Length: 15.84 2-3″ Shock:- Travel: 9.86- Extended Length: 27.39- Compressed Length: 17.53 4-5″ Shock:- Travel: 10.36- Extended Length: 28.89- Compressed Length: 18.53 Fits:Ram 2500 (2015+)