Aftermarket replacement ring and pinion gear set featuring a 3.73 gear ratio designed for Rockwell-Meritor heavy-duty tandem and single drive axles. Specifications & Application Manufacturer / Brand: World American (replaces Meritor/Rockwell OEM part A-40504-1) Gear Ratio: 3.73 Application: Fits Meritor / Rockwell SSHD (rear-rear), SHR, or single-axle R155 differential configurations. Interchange / Replaces: Direct replacement for old stock numbers including Meritor A-40504-1 and older number A40820-1.
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