Fox 2.5 HTO Performance Front Shock | Single | 0-1.5 in Lift | 2005-2026 Ford F-250/F-350

Fox 2.5 HTO Performance Series Front Shock | Single Unit | 0–1.5" Front Lift | 2005–2026 Ford F-250 / F-350 Super Duty

The Fox 2.5 HTO Performance Series front shock (SKU: AX4000) is a step-up heavy-duty front shock engineered for 2005–2026 Ford F-250 and F-350 Super Duty trucks running stock height or up to 1.5" of front lift. The larger 2.5" aluminum body increases oil volume for superior heat capacity and fade resistance vs. the Fox 2.0 AX154 (same platform, same lift range). HTO (High Travel Output) valving delivers controlled, consistent damping under sustained towing, hauling, and rough-road conditions. The IFP (Internal Floating Piston) design separates oil and nitrogen gas to maintain consistent damping through heat cycles. Tuned specifically for the F-250 and F-350 front suspension chassis — not a universal shock. Sold as a single front shock.

Verified Fitment (OFAS Standard)

• Ford F-250 Super Duty (Front): 2005–2026 — stock height to 1.5" front lift
• Ford F-350 Super Duty (Front): 2005–2026 — stock height to 1.5" front lift

Does NOT fit: Ford F-450 or F-550 (different front suspension geometry). Does not fit 1999–2004 Super Duty (different front shock mounting). Does not fit trucks with more than 1.5" of front lift — a longer-travel shock is required. Not compatible with long-travel or coilover conversion systems. Does not fit F-150.

Fox 2.5 HTO vs. Fox 2.0 AX154 (Same Platform, Same Lift Range)

• Body diameter: 2.5" (vs. 2.0" on AX154) — greater oil volume, superior heat capacity under sustained load
• Valving: HTO (High Travel Output) — tuned for sustained heavy-load damping vs. standard IFP valving on AX154
• Lift range: 0–1.5" — identical to AX154; upgrade is in body size and valving, not travel
• Price: $346.95 (vs. $229.95 for AX154) — recommended for high-frequency towing, max payload, or extreme duty cycles
• Weight: 8 lbs (vs. 7 lbs for AX154)

Technical Specifications

• SKU: AX4000
• Series: Fox 2.5 HTO Performance Series
• Position: Front
• Quantity: Single shock (order 2 for a complete front pair)
• Body: 2.5" aluminum — increased oil volume vs. 2.0" Fox 2.0
• Damping: HTO valving + IFP (Internal Floating Piston)
• Lift Range: 0–1.5" front lift
• Weight: 8 lbs
• Application: High-frequency towing, max payload, sustained heavy-duty use

Installation Notes

• Sold as single: This listing is for one (1) front shock. Order quantity 2 for a complete front replacement pair.
• Lift confirmation required: Verify front lift height is 0–1.5" before ordering. Installing on a truck with more than 1.5" of front lift will result in incorrect shock travel and potential bottoming or topping out.
• Torque specs: Upper and lower mounting hardware — torque to OEM specification for Ford F-250/F-350 front shock mounts (verify in Fox install sheet or Ford service manual). Do not overtorque aluminum-bodied shock mounts.
• Alignment recommended: A front-end alignment check is recommended after front shock replacement, particularly if the truck has been running worn shocks.
• Replacement interval: Inspect for oil weeping, fade, or excessive body heat after installation. Fox 2.5 shocks are rebuildable — retain the shock body for future service.
• Pairing note: For optimal handling balance, replace front shocks in pairs. Mismatched damping rates between left and right will cause instability under braking and cornering.

Installation Warning

Do not install on trucks with more than 1.5" of front lift — incorrect shock travel will result in bottoming or topping out under load. This shock is not compatible with long-travel or coilover conversion systems. Sold as a single unit — verify quantity before ordering. Once installed, the unit is non-returnable.

What is your current front lift height, tow/payload frequency, and are you replacing one shock or a complete front pair — confirm whether the 2.5 HTO or Fox 2.0 AX154 is the right spec for your duty cycle?