The Eaton Fuller 5th B Gear, part number 8873629, is a genuine OEM manual transmission component designed for heavy-duty truck transmissions. This gear serves the 5th speed B position in Eaton Fuller manual transmission assemblies, making it a direct-replacement part for in-service overhauls and rebuilds. Sold individually (each), this gear is the correct OEM reference for applications calling out part 8873629 or the cross-reference HF8873629. Call us to confirm proper fit for your specific transmission model and application.FeaturesGenuine Eaton Fuller OEM manual transmission gearFits the 5th speed B gear position in Eaton Fuller heavy-duty transmissionsSold as individual unit (each)Cross-referenced as HF8873629Direct OEM replacement for in-service overhaul and rebuild applications