Fox 2.0 Performance Series Rear IFP Shock | Single | 0-1" Lift | 2017-2026 Ford F-250/F-350 Super Duty | SKU 985-24-151
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Before ordering, verify your vehicle details, current setup, and SKU with OFAS fitment support so your upgrade matches your build.
Shipping & Delivery
Free shipping is available within the lower 48 U.S. states. Large or heavy items may ship by freight, and delivery timing can vary by warehouse, carrier, and product availability.
Fitment, Shipping & Product Support
The Fox 2.0 Performance Series Rear IFP Shock (SKU 985-24-151) is engineered for 2017–2026 Ford F-250 and F-350 Super Duty 4WD trucks running stock height or up to 1" of rear lift. 2" diameter CNC-machined 6061-T6 aluminum body with a clear-anodized finish — increases cooling capacity versus the factory steel-bodied shock and will not rust. 5/8" hard chrome plated, heat-treated alloy steel shaft. Internal Floating Piston (IFP) mono-tube design separates shock oil from the high-pressure, nitrogen-charged gas chamber, eliminating oil aeration for consistent damping through heat cycles during towing, hauling, and rough-road use. Race-developed high-flow damping piston with application-specific valving tuned to the F-250/F-350 Super Duty chassis. 11.6" stroke; 30.05" extended length, 18.45" compressed length. Direct bolt-on replacement for the factory shock. Sold as a single rear shock.
Order quantity 2 for a complete rear pair. An alignment by a qualified shop is recommended after installation.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | 985-24-151 |
| Brand | Fox |
| Series | 2.0 Performance Series |
| Position | Rear |
| Quantity | Single shock — order 2 for a complete rear pair |
| Body | 2" diameter CNC-machined 6061-T6 aluminum, clear-anodized finish |
| Shaft | 5/8" hard chrome plated, heat-treated alloy steel |
| Damping | IFP (Internal Floating Piston) mono-tube — separates oil from nitrogen gas |
| Piston | Race-developed high-flow damping piston, application-specific valving |
| Stroke | 11.6" |
| Extended Length | 30.05" |
| Compressed Length | 18.45" |
| Bottom Mount | ES13 (P/N 213-28-007-B) |
| Lift Range | 0–1" rear lift |
| Skill Level | Light to moderate mechanical skill required |
| Post-Install | Alignment by a qualified shop recommended |
| Sold As | Each |
What Is and Is NOT Included
| Item | Included |
|---|---|
| 1x rear shock | ✓ |
| Mounting hardware | ✓ |
| Second rear shock | ✗ NOT included — order quantity 2 for a pair |
| Front shocks | ✗ NOT included — sold separately under a different part number |
Verified Fitment
| Vehicle | Years | Lift Range | Status |
|---|---|---|---|
| Ford F-250 Super Duty 4WD (Rear) | 2017–2026 | 0–1" | ✓ |
| Ford F-350 Super Duty 4WD (Rear) | 2017–2026 | 0–1" | ✓ |
| Ford F-450 Super Duty (Rear) | 2017–2019 | 0–1" | ✓ |
| Ford F-550 Super Duty (Rear) | 2017–2019 | 0–1" | ✓ |
| Ford Super Duty (Rear) | 1999–2016 | Any | ✗ Different chassis generation — requires a different Fox part number |
| Ford F-150 | Any | Any | ✗ Different platform |
| Rear lift exceeding 1" | — | — | ✗ Requires a longer-travel Fox shock (e.g., 985-24-152 for 1.5–3.5" lift) |
Critical Compatibility
| Configuration | Notes |
|---|---|
| 1999–2016 Super Duty | Does not fit — this part number is specific to the 2017+ redesigned chassis |
| Rear lift over 1" | Will cause incorrect shock travel, bottoming, or topping out — order the correct lift-range part number instead (e.g., 985-24-152 for 1.5–3.5") |
| Long-travel or coilover conversion suspension | Not compatible |
| Mismatched left/right shocks | Replace in pairs for handling balance — mismatched damping rates between sides causes instability under load |
Common Questions
Does this fit my 2015 F-350?
No. This part number is for the 2017+ redesigned Super Duty chassis only. A 1999–2016 truck needs a different Fox rear shock part number — confirm your model year before ordering.
Does this fit an F-450 or F-550?
Yes, for 2017–2019 models.
Do I need one or two?
This listing is for a single shock. Order quantity 2 for a complete rear pair — and replace both sides together for balanced handling.
What if my rear lift is more than 1"?
This shock is valved specifically for 0–1" of rear lift. A taller lift requires a different Fox part number with a longer stroke (e.g., 985-24-152 for 1.5–3.5" lift) — installing this one on a taller lift will cause incorrect travel and potential bottoming or topping out.
Do I need an alignment after installing this?
Yes, recommended by Fox. Have a qualified shop check the alignment after installation.
The Obsidian Take
The 985-24-151 is for the 2017–2026 F-250/F-350 Super Duty owner — or 2017–2019 F-450/F-550 owner — running stock height or up to 1" of rear lift who wants Fox's IFP damping and aluminum-body heat dissipation over the factory steel shock. Direct bolt-on, no fabrication, application-specific valving for this exact chassis.
The one check that matters before ordering: confirm your truck is 2017 or newer. This part does not cover the earlier Super Duty generation, which requires a different Fox part number entirely.
Non-Returnable Notice: Once installed, this unit is non-returnable. Confirm model year, rear lift height, and quantity before ordering.
⚠️ California Proposition 65 Warning: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information visit P65Warnings.ca.gov.
Specifications sourced from Fox and authorized distributor documentation. Obsidian Forged Auto Supply is an authorized Fox dealer. Manufacturer specifications are subject to change without notice.