FOX 2.5 Factory Race Series Internal Bypass Shocks (883-06-227) for 2007–2014 FJ Cruiser & 2003–2024 4Runner

Upgrade your Toyota 4Runner or FJ Cruiser with the FOX Factory Race Series 2.5 Internal Bypass Shocks (883-06-227)—a premium suspension system engineered for high-speed off-road performance, improved ride comfort, and maximum control across rugged terrain. Designed as a direct bolt-on upgrade, these shocks deliver the same race-proven technology used by professional off-road teams.

At the heart of this setup is FOX’s patented Internal Bypass technology, which provides multiple zones of velocity- and position-sensitive damping. This allows the shocks to stay plush in the ride zone while progressively increasing damping to prevent harsh bottom-outs, control top-outs, and stabilize hard landings. As the piston moves beyond the ride zone, bleed ports close off to force fluid through the main piston—delivering precise, controlled suspension response in demanding conditions.

Built to last, the 2.5" impact-extruded and CNC-machined 6061-T6 aluminum shock bodies feature a Type III hard anodized finish that resists corrosion and wear. The Dual Speed Compression (DSC) adjuster lets you fine-tune your suspension for load, terrain, and driving style. External reservoirs with an internal floating piston (IFP) increase oil capacity and maintain consistent damping by separating nitrogen and shock oil—keeping temperatures stable during extended high-speed runs.

Whether you’re carving desert roads, tackling rocky trails, or outfitting an overland build, FOX 2.5 Internal Bypass Shocks provide unmatched stability, support, and confidence.

Part Number

883-06-227

Key Features

• 2.5" impact-extruded & CNC-machined 6061-T6 Type III hard anodized aluminum body

• Patented Internal Bypass technology for position-sensitive damping

• DSC (Dual Speed Compression) external adjuster

• External reservoir with IFP (Internal Floating Piston)

• 7/8" hard-chromed alloy steel shafts

• Application-specific springs & valving

• Vehicle-specific tuning for maximum performance

• Redundant sealing pack: main seal, wiper seal, scraper seal

• Race-developed high-flow piston design

Technical Specs

• Series: Factory Race

• Travel: 5.29"

• Extended Length: 22.48"

• Compressed Length: 17.19"

• Top Mount: OEM

• Bottom Mount: Eyelet

• Body Diameter: 2.5"

• Finish: Hard-anodized for long-term durability

Fitment Notes

⚠️ Requires aftermarket Upper Control Arms (UCA).

Compatible with:

• 2003–2024 Toyota 4Runner

• 2007–2014 Toyota FJ Cruiser