This rear shock comes from FOX's 2.0 Performance Series in a remote-reservoir, smooth-body design for a 7-10in rear lift on Chevy HD trucks. Forum members who compared it with the 2.0 IFP style consider the reservoir version tunable and rebuildable, which matters if you plan to keep a lifted truck for years. Discussions also point to a Chevy HD-specific build, and one owner notes that its factory spec keeps the travel the truck had from the factory. That makes the setup relevant if you add control-arm drop.
Confirm fitment before you buy, because year coverage varies across sources and you should check your exact model year and lift height with the manufacturer. One owner with a 6-inch lift who chose the 4-6 option found about a half-inch gap that had to be tightened during fitting. For the install itself, the manufacturer's install sheet for another Fox 2.0 reservoir application reuses the OE bolts and points the reservoir rearward and angled, and the reservoir clamp is set with a 1/4in hex key. Because the shock is gas-charged and highly pressurized, never vise-clamp it, heat it, or open it without the proper tools. Buyers searching for 7-10 inch lift rear shocks for a Chevy HD, Fox 2.0 remote reservoir replacements, or a lifted 2500HD ride upgrade will find this as a direct-fit option.
This version is specified for a 7-10in rear lift. An owner on a 6-inch lift who chose the 4-6 option reported a gap that had to be tightened during fitting, so confirm the correct lift option with the manufacturer before ordering.
Owners on user forums say that adding a control arm that increases downward travel can call for a Cognito-specific Fox 2.0 Performance reservoir shock. Check with the manufacturer before assuming the standard version will work.
The manufacturer treats these as gas-charged, high-pressure units. Placing the shock in a vise or clamp, applying heat, or attempting to open or service it without the proper tools can damage the shock or cause injury.
This is a moderate DIY job that reuses the factory hardware. Plan for jack stands and axle support, because it may be necessary to support or raise the vehicle axle in order to remove bolts and install the new shock. Keep the stock lower hardware, since it will be used with your new shock. Use a torque wrench for the factory mounting points, and face the hoses outward and toward the rear of the vehicle on external reservoir models. When you mount the reservoir clamp, keep it away from decals, since the manufacturer warns that a clamp placed over a decal could damage it.
