ZF 4644.311.081 OUTPUT GEAR for WG181 | OEM Genuine Part

Overview

The ZF 4644.311.081 OUTPUT GEAR is a critical drivetrain component engineered specifically for the WG 181 series transmission. This OEM genuine part transfers rotational force from the planetary gearset to the output shaft, ensuring smooth power delivery in heavy-duty industrial applications. As a high-torque interface, the 4644.311.081 gear sits at the rear of the transmission housing, directly engaging with the differential or final drive assembly. Precision-machined from case-hardened alloy steel, this output gear maintains exacting tolerances to minimize backlash and reduce wear under sustained load. The SKU 4644.311.081 is manufactured to ZF’s original specifications, guaranteeing a direct fit and factory-rated performance for your WG181 rebuild or repair.

Symptoms of Failure

• Audible whining or grinding noise from the transmission output area – Worn gear teeth produce a distinct high-pitched whine during acceleration or deceleration, often mistaken for bearing failure.
• Vibration under load – A damaged output gear creates uneven rotational forces, causing noticeable driveline shudder when pulling heavy loads or climbing grades.
• Metal particles in transmission fluid – Flaking or spalling on the gear surface contaminates the oil with metallic debris, visible during routine fluid changes or when inspecting the magnetic drain plug.
• Intermittent power loss or gear slippage – Excessive tooth wear reduces engagement depth, leading to momentary loss of torque transfer under high-stress conditions.

Technical Specifications

Compatibility

This output gear is designed for the ZF WG 181 series transmission, commonly found in mid-range trucks, construction loaders, and agricultural tractors. Based on its spline profile and gear ratio, the 4644.311.081 also fits select variants of the WG 180 and WG 200 series where the output shaft configuration matches. Always verify your transmission’s serial number against ZF’s parts catalog before installation. The gear interfaces directly with the 4644101047: TRANSMISSION HOUSING and the 4644301380: HOUSING assembly, requiring precise alignment during rebuild. A 4644301189: THREADED BUSH secures the gear’s axial position, while the 0730365067: TYPE PLATE identifies the correct transmission variant for cross-referencing.

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