Firestone:AS9978

Description

Firestone AS9978 Air Spring / Air Suspension
Designed to support vehicle suspension systems by absorbing shock, reducing vibration, and maintaining proper ride height. Manufactured by Firestone Industrial Products, this air spring delivers reliable load support and ride quality for trucks, trailers, and other commercial vehicle applications.
Built with a durable rubber bellows and reinforced end plates, the AS9978 is engineered to withstand harsh operating conditions while providing consistent performance under load. It helps improve vehicle stability, protects suspension components, and enhances driver comfort by isolating road impacts.

Features
Genuine Firestone Industrial Products air spring
Designed for air suspension systems
Helps maintain proper ride height under varying loads
Reduces vibration, shock, and suspension wear
Heavy‑duty rubber construction for long service life
Direct‑fit replacement for compatible applications

Specifications
-Dimensional
Extended Height: 17.0 – 18.0 in
Compressed Height: 7.8 – 7.9 in
Design (Ride) Height: ~11.5 in
Maximum Diameter: ~12.6 in
Top Plate Diameter: 9.0 in
Piston Diameter: ~9.75 – 10.25 in
-Mounting & Hardware
Top Plate Holes: 2
Top Plate Hole Spacing (C‑C): 5.5 in
Piston Holes: 1
Piston Hole Spacing (C‑C): 2.25 in

Cross References
Firestone: W01‑358‑9978 / 9978
Hendrickson: S‑28929 / C‑28929
ContiTech: 67588
Goodyear: 1R12‑668
Automann: AB1DK23I‑P959
Dayton: 452‑9978 / 452‑9978L