Fox Racing Shocks 981-40-403-R Factory Race 4.0x18 External Bypass 5-Tube Piggyback Shock Right

The Fox Racing Shocks 981-40-403-R is a Factory Race Series 4.0-inch diameter, 18-inch external bypass piggyback shock absorber designed for serious off-road racing and high-performance suspension applications. Built with a 5-tube external bypass configuration, this right-side shock delivers precise, independently tunable damping across multiple zones of the shock stroke — allowing racers to optimize performance for varying terrain conditions.

The 4.0-inch main body diameter provides a large oil volume, helping dissipate heat during extended high-speed off-road use and maintaining consistent damping performance even under the most demanding race conditions. The piggyback reservoir adds additional oil and nitrogen gas capacity, further reducing fade and improving sustained performance on long desert runs or trail events.

Key Features:

• 4.0-inch body diameter for maximum oil volume and heat dissipation
• 18-inch travel for long-travel suspension builds
• 5-tube external bypass configuration for fully adjustable, zone-specific damping control
• Piggyback reservoir for increased oil and nitrogen capacity
• Right-side application — sold individually
• Rebuildable and serviceable for extended service life and long-term value
• Custom valving options available to tailor performance to specific vehicle setups and race conditions
• Nitrogen-charged design for consistent, aerated-free damping performance
• Premium Fox internal components and seals for race-proven durability

As part of Fox's Factory Race lineup, the 981-40-403-R represents the pinnacle of off-road shock technology, trusted by professional desert racers and serious enthusiasts alike. Its fully rebuildable construction and availability of custom valving make it a long-term investment for competitive off-road builds.