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and load rating against your existing air spring before ordering — multiple Firestone rolling-lobe springs share similar dimensions but differ in plate stud configuration
Fits both Big Cam and Small Cam 855 configurations
Western Star 4900 / 5700 / 4700 (Eaton-spec)
excavators with Volvo D-series power)
World American WA01-9978C Air Spring | Replaces Mack 8446-S28929 Filtration and load rating against yourThe World American WA01 9978C is a heavy duty rolling lobe air spring engineered for trailer suspensions. Designed as a direct replacement for Mack 8446 S28929, this OEM equivalent spring delivers consistent height control, superior durability, and reliable damping for long haul and vocational trailers. Built to withstand harsh road conditions and heavy loads on highways and back roads. Specifications Category Air Springs Air Bags Part Type Trailer
