The FOX 2.0 Performance Series smooth-body IFP rear shock (part 980-24-660) is built for 99+ Chevrolet 1500 trucks with 0 to 1 inch of rear lift. Its internal floating piston keeps the nitrogen charge separate from the shock oil. The manufacturer says this prevents oil aeration, so the factory-tuned valving stays consistent over rough pavement and dirt. Each unit pairs a race-developed high-flow piston with application-specific valving.
A stock replacement tends to feel mushy after repeated hard use, and a cheaper twin-tube unit rarely offers this kind of oil and gas separation. The 2.0-inch body is CNC-machined aluminum with a clear-anodized finish, so it resists corrosion on salted roads. The manufacturer describes the sealing as redundant and the shock as serviceable and tunable, which means a seal or oil service is possible when the unit wears rather than a full replacement. Searching for a FOX 980-24-660 Silverado 1500 rear shock, a 0-1 inch lift IFP rear shock, or a 2.0 Performance Series Sierra 1500 rear shock? This is the part to compare.
The manufacturer rates this shock for 0 to 1 inch of rear lift. It is essentially a stock-length replacement, so measure your rear lift height before ordering. A taller lift may leave the shock too short.
Fitment coverage varies by listing. Coverage is described as starting in 1999, but sources differ on the upper model year and on whether 4WD trucks are included. Confirm with the manufacturer using your VIN before buying.
The manufacturer describes the Performance Series 2.0 shocks as 100 percent serviceable and tunable, so the seals and oil can be serviced over the shock's life.
This is a bolt-on rear shock swap that does not require body or suspension modifications, so most DIYers with basic hand tools can handle it. Plan for a socket set, penetrating oil for seized fasteners, and a torque wrench. Confirm the torque values on the manufacturer's install sheet before tightening, because the exact specs for this part were not confirmed during research. Check your rear lift height before you start, since a shock that is too short will limit suspension travel.
