The FOX 985-24-113 is a rear shock from the Performance Series 2.0 line, built on an aluminum body with an external remote reservoir. The manufacturer describes a clear-anodized aluminum body that sheds heat faster than a steel body, plus an internal floating piston that keeps shock oil apart from the nitrogen charge. It is sized for the 97-06 Jeep Wrangler TJ and offers 9.6 inches of travel, so it suits a lifted TJ looking for a rear shock with more oil and nitrogen capacity than a stock unit.
The manufacturer says the shock uses race-developed high-flow damping and application-specific valving, aimed at predictable ride quality on rough trails and smoother road manners on pavement. The external reservoir adds oil and gas volume and gives the shock its race-style look, which matters for owners who run hard on desert or rock trails and want a rear damper that holds up better than a basic shock. If you are comparing it with a cheaper bolt-on, the valving and reservoir design are the main differences to weigh. Search terms this shock covers include 97-06 TJ rear reservoir shock, Fox 2.0 remote reservoir rear, and TJ 4-6 inch lift rear shock.
The product name covers 97-06 Jeep TJ applications at both 4-6 inch and 3.5-4.5 inch lift heights. Because those ranges are listed together, confirm the correct setup with the manufacturer before ordering for your specific lift.
The manufacturer's install instructions for Performance Series reservoir shocks describe a supplied reservoir clamp and bolt assembly that mounts the reservoir to the shock body, tightened with a 1/4 inch hex key. Confirm the exact hardware included in your kit with the manufacturer.
Per the manufacturer's reservoir shock guidance, the job is a standard rear swap: raise the vehicle, remove the rear wheels and stock shocks, then reuse the OEM hardware and torque to OEM specifications. Mount the reservoir clamp, route the hose so it is clear of moving parts, and secure it with zip ties. Do not clamp the shock in a vise, apply heat, or try to open it, because the shock is gas-charged and highly pressurized. On a TJ, owners on user forums report that the upper bar pin is the usual sticking point. They press it out with a vise and deep socket, a ball joint press, or a bench press with a light lubricant, so have a press and a bit of penetrating lubricant on hand. Because the shock is longer than the stock unit, check for clearance with the tires and brake lines before driving.
