Overview
The Fox Racing Shox 985-24-045 is a 2.0 Performance Series IFP shock with a 2.0-inch body and a 5/8-inch shaft. It is a gas-charged hydraulic shock with an Internal Floating Piston (IFP), a layout that separates shock oil from a nitrogen gas chamber to keep ride quality steady over rough ground.
Fox builds its shock lines for racing and off-road use. This 2.0 Performance Series unit has an internal reservoir and an aluminum body with a black finish, and it is an OEM direct replacement mount for a 2WD rear application. Travel and extended and collapsed lengths depend on the application.
Key features
- Internal Floating Piston separates shock oil from a nitrogen gas chamber
- Internal reservoir
- Aluminum shock body with a black finish
- OEM direct replacement mounting
- 2.0-inch body diameter and 5/8-inch shaft
- Fits a 2WD rear application
How IFP shocks work
An internal floating piston sits inside the body and separates the shock oil from a high-pressure gas chamber. As the shock moves, the piston slides to balance the oil and gas volumes, which keeps the damping steady and reduces foaming. That steadiness is useful on rough ground, where a shock can heat up quickly.
Internal reservoir shocks differ from external reservoir designs in how the oil and gas are housed. The reservoir is built into the body here, so there is no separate hose to route. When replacing a rear shock, measure the old unit and check that the lower and upper mounts line up with the new one before tightening anything.
Rear shocks also work with the leaf springs or coils, bump stops and bushings around them. Replacing the shock alone may not fix a ride that feels loose, so check those parts while the shock is out.
- Avoid heat near the shock body during welding or repairs
- Check the rear mounts for worn rubber or cracks
- Replace both rear shocks on an axle when one is worn
Specifications
| Brand | Fox Racing Shox |
|---|---|
| Part number | 985-24-045 |
| UPC | 70000639643 |
| Series | 2.0 Performance Series |
| Shock type | Hydraulic, gas charged |
| Body diameter | 2.0 inch |
| Shaft size | 5/8-inch diameter |
| Finish | Black and aluminum |
| Travel | Application specific |
| Extended length | Application specific |
| Collapsed length | Application specific |
| Reservoir | Internal |
| Mounting | OEM direct replacement |
| Application | 2WD rear |
Vehicle fitment
Confirm fit for your vehicle’s year, model and trim before ordering. This shock is for a 2WD rear application, so match your drivetrain and mounting points before choosing it.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Because travel and lengths are application specific, measure the installed length and compressed length of the original rear shock before ordering a replacement.
What’s included
Mounting hardware and any other items sold separately should be checked against your installation before starting.
Not included: Check mounting hardware and any sold-separately items against your installation before fitting.
