Fox Coilovers: 2.0 and 2.5 Series, Fitment, and How They Compare to King

Fox sells its truck coilovers under two body diameters, each with its own level of oil capacity and adjustability. The 2.5 Factory Series is offered either as a plain remote-reservoir shock or with Fox's DSC (dual-speed compression) adjuster built into the reservoir.

The larger 2.5-inch body gives about 23% more internal surface area than the 2.0-inch body, which Fox markets as helping the shock dissipate heat and resist fade on longer rough-road runs.

The 2.0 Performance Series is the entry point: a sealed IFP shock meant to bolt in place of the stock front strut/shock on trucks like the F-150, with no cutting, and tuned for stock ride height up to about 2 inches of lift. It suits owners who want a noticeable ride-quality upgrade without adding reservoirs or adjusters to maintain.

The 2.5 Factory Series steps up for trucks that spend real time off-road, towing, or carrying a bed full of gear. The remote reservoir adds oil volume and a larger-diameter piston, and the DSC version lets you back off compression damping for a smoother highway ride, then firm it back up before hitting trails, all through a dial on the reservoir.

Several truck-specific suspension companies also sell rear coilover conversion kits that swap a factory leaf-spring rear end for a Fox 2.0 or 2.5 body shock paired with a dedicated coil spring, most commonly on F-150 and Tacoma builds running larger tires. These kits reuse the same Fox shock bodies covered above, with brackets built for the specific truck's rear axle.

King is the coilover brand Fox gets cross-shopped against most in truck forums. King builds a similar spread of 2.0 and 2.5 reservoir coilovers for the same truck platforms, and owners often say the choice comes down to local dealer support and preferred valving feel rather than a clear gap in off-road capability.

Against Bilstein, several F-150 owner threads describe the Fox 2.5's on-road damping as comparable to Bilstein's remote-reservoir shocks, well controlled over bigger hits, though Bilstein's catalog leans more toward direct stock-replacement applications and sits in a different price tier depending on the kit.

QA1 takes a more motorsport-oriented approach with fully serviceable, double-adjustable coilovers aimed at racers and builders who want to rebuild and re-valve their own shocks, which is a different use case than Fox's bolt-on truck focus.

Fox markets its truck coilover kits as bolt-on replacements for the stock front strut or shock assembly on most supported applications, without cutting or drilling. Remote-reservoir 2.5 kits add a reservoir mounting bracket, which is included with the kit, and the reservoir hose needs to be routed clear of steering and suspension travel.

Ride height and spring preload adjust the same way across the lineup: a threaded collar locks the coil spring in place, and turning it up or down changes preload and static ride height within the shock's travel. See our coilover adjustment guide for the general procedure. On the 2.5 Factory Series DSC, there's also an external low-speed and high-speed compression dial on the reservoir that changes damping stiffness without opening the shock.

Because installing coilovers changes ride height and alignment angles, a professional alignment afterward is recommended regardless of series. Our installation and cost guide covers typical labor and alignment costs for this type of job.