The FOX 980-24-664 is a rear Smooth Body shock from FOX's 2.0 Performance Series for 99+ Chevy HD trucks, built on an Internal Floating Piston (IFP) monotube design. The manufacturer explains that the floating piston keeps shock oil apart from the high-pressure, nitrogen-charged gas chamber, which prevents oil aeration so the factory-tuned precision valving can perform as designed. That matters on rough pavement, washboard gravel, and loaded towing, where a standard stock shock can lose composure. The aluminum body and 0-1 inch lift rating make this a targeted upgrade for a leveled HD truck, and its 9.62 inch travel gives it room to work on a lifted setup.
Shoppers searching for a FOX 2.0 IFP rear shock, a Chevy HD 2.0 performance rear shock, or a 0-1 inch lift rear shock for a Silverado 2500HD or 3500HD should verify fitment before buying, because sources disagree on exact model years and configurations. Confirm your truck's year, cab, and lift height with the manufacturer before ordering. The manufacturer's install sheet was not located during this research, so check mounting hardware and bushing compatibility with the manufacturer before starting the swap. Replace shocks in pairs on each axle for balanced damping and a consistent ride.
The manufacturer states that the internal floating piston separates the shock oil from the nitrogen-charged gas chamber, which eliminates oil aeration and lets the factory-tuned valving work as intended.
The manufacturer's product listing shows 9.62 inches of travel for this part.
Fitment details vary across sources for model years and HD configurations, so the manufacturer should confirm compatibility for your exact truck and lift height before you order.
