The ILJIN 3984ASH is a tapered roller bearing cone (inner ring) commonly paired with the 3920ASH race (outer ring) for high-load applications. It is specifically used as a Dana M300 carrier side bearing on 2017+ Ford Super Duty F-350 and F-450 DRW trucks. It also fits 12k-16k lb Dexter and Lippert (LCI) trailer axles as an outer bearing.
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