ATRO AS1R-9978-C | Rolling Lobe Air Spring

ATRO AS1R-9978-C Rolling Lobe Air Spring

The ATRO AS1R-9978-C Rolling Lobe Air Spring is a heavy-duty replacement air spring designed for compatible commercial truck and trailer air suspension applications. Its rolling-lobe design allows the spring to accommodate suspension travel while helping maintain proper ride height, load support, and ride quality.

The AS1R-9978-C is part of the ATRO AS1R rolling-lobe air spring series, engineered for demanding heavy-duty suspension applications. ATRO air springs feature a proprietary vulcanization process, enhanced anti-friction pattern, rubber bumper support, and included hardware kits on applicable models.

The 9978 air spring application family cross-references several major suspension manufacturers, including Firestone, Goodyear, Continental-ContiTech, Hendrickson, Automann, Dayton, and Meritor. Always verify the existing air spring, OEM number, dimensions, and mounting configuration before ordering.

Key Features

• ATRO AS1R-9978-C rolling lobe air spring
• Heavy-duty air suspension replacement
• Rolling-lobe air spring design
• Designed for commercial truck and trailer applications
• Helps maintain proper suspension ride height
• Helps support vehicle loads and absorb road shock
• ATRO proprietary vulcanization process
• Enhanced anti-friction pattern
• Rubber bumper support when airing down
• Designed for demanding heavy-duty service

Specifications

• Brand: ATRO
• Part Number: AS1R-9978-C
• Product Type: Air Spring
• Air Spring Type: Rolling Lobe
• Application: Heavy-Duty Air Suspension
• 9978 Family: Rolling Lobe
• Firestone Cross Reference: 9978 / W01-358-9978
• Goodyear Cross Reference: 1R12-1179 / 1R12-668
• Continental-ContiTech Cross Reference: 67588
• Hendrickson Cross Reference: S-28929

Common Applications

The ATRO AS1R-9978-C is intended for compatible heavy-duty rolling-lobe air suspension systems. The 9978 application family is commonly associated with Hendrickson Intraax and Vantraax suspension applications as well as other commercial truck and trailer suspension systems.

Because air springs can vary by suspension design, ride height, mounting configuration, and piston or plate dimensions, fitment should be verified by the existing part number and physical specifications before ordering.

OEM & Cross Reference Part Numbers

The ATRO AS1R-9978-C is associated with the following 9978-family cross-reference numbers:

• ATRO: AS1R-9978-C
• Firestone: 9978
• Firestone: W01-358-9978
• Goodyear: 1R12-1179
• Goodyear: 1R12-668
• Continental-ContiTech: 67588
• Hendrickson: S-28929
• Hendrickson: C28929
• Meritor: FS9978
• Automann: AB1DK23I-A959
• Automann: AB1DK23I-P959
• Dayton: 352-9978
• Dayton: 452-9978
• Torque: TR9978
• Paccar Parts: AS99780
• Triangle: AS-9978

Cross-reference numbers are provided for identification purposes. Always verify the exact application, dimensions, mounting pattern, and OEM number before ordering.

9978 Air Spring Dimensions

Published specifications for the 9978 application family identify approximately 7.8 inches collapsed height and 19.6 inches extended height. Other specifications can vary between manufacturers and specific replacement versions, so the existing air spring should be measured before installation.

The application family commonly uses a 9-inch top plate and a single bottom mounting configuration. Verify the actual mounting arrangement on your vehicle before ordering.

Why Replace a Heavy-Duty Air Spring?

Air springs are critical suspension components that help support vehicle weight while maintaining proper ride height and absorbing road shock. Over time, air spring bellows can develop cracks, leaks, dry rot, or other damage.

A leaking or damaged air spring can cause improper ride height, poor ride quality, increased compressor cycling, uneven suspension loading, and additional stress on other chassis components.

Replacing a worn air spring with the correct application can help restore suspension performance and maintain proper vehicle operating height.

Why Choose ATRO AS1R-9978-C?

The ATRO AS1R-9978-C provides a heavy-duty rolling-lobe replacement option for compatible air suspension systems. ATRO's air springs are engineered with a proprietary vulcanization process and enhanced anti-friction design intended to support durability and service life in demanding truck and trailer applications.

ATRO currently backs its air springs with a 3-year U.S./Canada warranty, providing additional coverage for qualifying applications.

Air Spring Fitment Verification

Always verify air spring fitment before ordering. Air springs that share similar cross-reference numbers can still vary in mounting hardware, plate configuration, ride height, piston design, and dimensions.

For the most accurate replacement, compare the existing air spring's part number, collapsed height, extended height, top plate diameter, bottom plate configuration, mounting holes, and air fitting location with the replacement.