FOX Off-road Shocks FRS 4.0″ x 18″ External Bypass 5 Tube Piggyback 981-40-403-L



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FOX dedicates substantial time and resources to perfecting the Fox Shocks 981-40-403-L Factory Race Series 4.0″ x 18″ External Bypass 5 Tube Piggyback through exhaustive research and development efforts. Whether navigating across desert sands or maneuvering up a rocky slope on a tilted surface, our shocks are meticulously engineered to offer exceptional damping, precise suspension control, and optimal spring rates to ensure success in any terrain or challenge.

  • Black Anodized CNC Machined Aluminum Components
  • Dual coated steel body with proprietary FOX Grey Cerakote® protective ceramic coating over zinc plated base-coat
  • Fox Racing Oil Developed For Ultimate Performance
  • 1-1/8″ hard chrome plated 17-4 H900 stainless steel shaft
  • Packed Race Winning Technology

Additional information

Weight 65 lbs
Dimensions 48 × 10 × 10 in

Off Road Shocks


Shaft Diameter






Fox Grey Cerakote

Bypass Layout

Left Side


Compressed Length: 46.55″

Extended Length: 28.55″

Travel: 18″

Shaft Diameter: 1 1/8″

Cylinder Plating: Fox Grey Cerakote / Shock Parts: Black Anodize

Reservoir: Piggyback 3.5″ x 17.5″

Tubes: (3) Compression / (2) Rebound

Mounting Width: 5/8″ x 1.5″