Fox Racing Shocks 981-02-394-1 3.5 Factory Race Series 12in External Bypass Piggyback Shock 4-Tube 1in Shaft Custom Valving

The Fox Racing Shocks 981-02-394-1 is a 3.5 Factory Race Series External Bypass Piggyback Shock featuring a 12-inch stroke, 4-tube bypass configuration (2 compression / 2 rebound tubes), a 1-inch shaft, and custom valving. Built for serious off-road racing and high-performance applications, this shock delivers the position-sensitive, externally adjustable damping that Fox's bypass lineup is renowned for.

Fox External Bypass shocks utilize an externally adjustable, position-sensitive damping architecture that delivers a progressive damping curve — eliminating harshness over small bumps and whoops while still providing the high-speed control needed to handle demanding terrain. The 4-tube bypass layout (2 compression, 2 rebound) allows precise tuning of damping forces at specific points throughout the shock's travel, making it ideal for custom-built race trucks, pre-runners, and serious off-road builds.

Key Features:

• 3.5 Factory Race Series external bypass design with piggyback reservoir
• 12-inch stroke for substantial suspension travel
• 4-tube bypass configuration: 2 compression tubes, 2 rebound tubes
• 1-inch hard chrome-plated 17-4 H900 stainless steel shaft — twice as strong as standard carbon steel shafts
• Custom valving for application-specific damping performance
• Smooth-bore, zinc-plated, honed seamless alloy body
• Black anodized 6061-T6 billet aluminum components
• Gen 3 clicker adjusters with 25% increased adjustment range over previous generation
• Color-coded black anodized adjuster housings (compression, rebound, and gold valves)
• Redundant sealing pack system with high-temperature Viton seals
• FOX-formulated racing oil for consistent performance across variable temperatures
• Rotating body cap design for easy tube and reservoir positioning during installation
• Lined, heat-treated alloy steel spherical bearings — 5/8-inch bolt x 1-1/2-inch wide mounting
• 100% rebuildable and serviceable for extended lifespan

The Fox 3.5 Series bypass shock platform delivers a progressive damping curve that eliminates harshness over rough terrain while maintaining the high-speed control required to stay composed at race pace. The piggyback reservoir provides additional oil volume for improved heat dissipation during extended high-intensity use. Custom valving ensures this shock is dialed in for your specific weight, travel, and driving demands straight from the factory.