Shock Therapy - Polaris RZR XP S Steering Rack

Important: This rack requires aftermarket tie rods with 5/8" rod ends on each end. Stock tie rods are not compatible.

Race Use Only: This is a race-specific part designed for racing applications. Race parts wear out and require periodic rebuilding. No warranty is provided.

Development Background

After racing a stock rack and pinion with 32" tires for 1500 race miles without issues, the factory rack suddenly sheared in half during a race, causing complete steering failure. Aftermarket replacements offered only marginally thicker gears and spread tie rod pivot widths by up to half an inch, introducing bump steer and dangerous handling characteristics. A billet rack option was too wide by 1.5 inches. With no suitable alternatives, a custom race rack was engineered with the following features:

Key Features

1. 7075 Aluminum Construction: High-grade aluminum nearly as strong as carbon steel, three times more expensive than standard 6000 series aluminum.
2. Hard Anodized Plating: Hardened surface prevents wear in harsh environments and extends internal rack life.
3. Dispersed Grease Passage Lubrication: Single grease fitting feeds six internal spots through a network of passages, including the pinion gear, all four sides of the rack gear, and vertical stress load points. Requires only two grease gun pumps every 1000 race miles.
4. 1" x 1" Square Rack Gear: Twice as thick as stock round gears at the tooth base and 125% stronger material. Square design prevents twisting that causes pinion tooth wedging and gear failure.
5. Pre-Heat Treated Rack Gear: Starts with pre-hardened material cut to perfect straightness, eliminating warping issues common with post-heat treatment. Maintains less than 1 thousandth of an inch runout for zero-tolerance fit in the rack body.
6. Patent Pending Gear Tooth Design: Custom tooth design with twice the base thickness of standard systems, developed through extensive testing and custom tooling.
7. Heat Treated Pinion Gear: Solid 4140 Chromoly material heat treated to 60 Rockwell hardness, harder than a carbon steel drill bit.
8. Pinion Bearings: High-tolerance $30 bearings with custom retainer plate featuring a 10 thousandth step for vertical preload. Bearing slides into housing with 1 thousandth inch clearance to prevent tightening on the pinion gear.
9. Faster Steering Ratio: 1.5-turn lock-to-lock system (versus 2-turn factory standard) for quicker response while maintaining comfortable steering feel with electric power steering.
10. High Quality Rod Ends: 5/8" FK JMX10-T Teflon-lined rod ends rated for a full Best in the Desert racing season without replacement.
11. Patent Pending "Taper Lock" Jam Nuts: Machinist tool taper design locks rod ends and jam nuts in place permanently. Also serve as steering stops. Prevents loosening common with standard jam nuts.
12. 4130 Chromoly Clevises: Solid construction with high-tolerance 5/8" diameter shoulder bolts. Available in three configurations:
    • Weld-on clevis for 1" .120 wall or 1.25" .095 wall tubing
    • 5/8" threaded clevis for aftermarket tie rods and long travel kits (Assault, Cognito, Long Travel Industries)
    • Extended threaded clevis for Lone Star tie rods

Note: This race rack does not fit 2017-2018 XPT models. A separate 2017-2018 XPT race rack option is available.