Description
The FOX® 985-24-105 is a 2.0 Performance Series smooth body remote reservoir rear shock with 13.6 inches of travel, built for 1999–2016 Ford F-250, F-350, F-450, and F-550 Super Duty trucks across a range of lift heights that vary by model and year.
IMPORTANT: Lift height coverage for this shock is not uniform across the full application range — confirm your exact model year against the fitment breakdown below before ordering. F-250 SD (1999–2016) and most F-350 SD model years run 1.5″–3.5″ of lift, but FOX®’s application data specifically calls out the 2007, 2009, and 2015 F-350 SD as covering a taller 4.5″–6.5″ lift range on this same part number. F-450 SD is listed at 6″–8″ lift for 2005–2008 and 2012–2016, but at a shorter 3″–4.5″ range for 2009–2011. F-550 SD runs 6″–8″ lift across the full 2005–2016 span. FOX® also lists a separate rear shock, part number 985-24-149, for 2017–2026 F-250/F-350 Super Duty at 1.5″–3.5″ lift — confirm your model year falls within this shock’s 1999–2016 range before ordering. This unit ships with the black-anodized billet reservoir clamp included; no additional hardware is required for installation.
This is a bolt-on aluminum-bodied shock built around FOX®’s Performance Series platform, designed to deliver race-proven damping performance in a hassle-free direct-fit package. The 2.0″ impact-extruded 6061-T6 aluminum shock body is clear-anodized for corrosion resistance and dissipates heat faster than a comparable steel-body shock.
An external reservoir increases total oil and nitrogen capacity over a standard monotube design, improving damping consistency during extended off-road runs or heavy-load towing where the shock is working hardest. The reservoir mounting clamp and other components are CNC-machined from black-anodized 6061-T6 billet aluminum.
A race-developed high-flow damping piston is matched with application-specific valving tuned for the Super Duty platform, delivering predictable ride quality across rough and uneven terrain. The shaft is 5/8″ hard chrome-plated, heat-treated alloy steel, and sealing is handled by a redundant three-stage system — main seal, wiper seal, and scraper seal — for long service life. FOX® backs this shock with a Limited Lifetime Warranty.
- Rear application for 1999–2016 Ford F-250, F-350, F-450, F-550 Super Duty — lift height varies by model/year, see fitment below
- 2.0″ impact-extruded 6061-T6 aluminum body, clear-anodized for corrosion resistance
- External reservoir for increased oil and nitrogen capacity
- Black-anodized, CNC-machined 6061-T6 billet aluminum components and reservoir clamp
- 5/8″ hard chrome-plated, heat-treated alloy steel shaft
- Race-developed high-flow piston with application-specific valving
- Redundant three-stage seal system: main seal, wiper seal, scraper seal
- Includes billet reservoir clamp — no additional hardware required
- FOX® Limited Lifetime Warranty
- Sold individually
| Part Number | 985-24-105 |
| Series | Performance |
| Position | Rear |
| Travel | 13.62 in |
| Body | 2.0″ impact-extruded 6061-T6 aluminum, clear-anodized |
| Components | Black-anodized, CNC-machined 6061-T6 billet aluminum |
| Shaft | 5/8″ hard chrome-plated, heat-treated alloy steel |
| Piston | Race-developed high-flow piston design |
| Valving | Application-specific |
| Seals | Redundant sealing pack: main seal, wiper seal, scraper seal |
| Extended Length | 33.52 in |
| Compressed Length | 19.9 in |
| Top Mount | Eyelet |
| Bottom Mount | Eyelet |
| What’s Included | Billet reservoir clamp |
| Warranty | FOX® Limited Lifetime Warranty |
| Sold As | Individually |
Per FOX®’s published application data: F-250 SD covers 1999–2016 at 1.5″–3.5″ lift. F-350 SD covers 1999–2006, 2008, 2010–2014, and 2016 at 1.5″–3.5″ lift, with 2007, 2009, and 2015 specifically listed at 4.5″–6.5″ lift instead. F-450 SD covers 2005–2008 and 2012–2016 at 6″–8″ lift, with 2009–2011 listed at 3″–4.5″ lift. F-550 SD covers 2005–2016 at 6″–8″ lift.
Match your exact model year to the lift range above before ordering — this SKU spans multiple lift-height applications depending on year and chassis, and F-350 SD in particular does not carry a single uniform lift spec across its full model range. For 2017–2026 F-250/F-350 Super Duty, use FOX® part number 985-24-149 instead.