ZF 4651.351.043 SPUR GEAR for WG100 | OEM Genuine Part

Overview

The ZF 4651.351.043 SPUR GEAR is a precision-machined helical gear designed for the WG 100 series transmission. This OEM genuine part transfers rotational force between parallel shafts within the gear train, directly influencing torque delivery and shift timing. Located in the upper countershaft assembly, the spur gear (SKU: 4651.351.043) works in concert with the 4651101007: TRANSMISSION HOUSING to maintain proper gear mesh alignment. As a hardened steel component, it withstands continuous high-load cycles in heavy-duty industrial applications.

Symptoms of Failure

• Whining or grinding noise during acceleration: Worn gear teeth produce a distinct metallic sound, especially under load, indicating surface fatigue or pitting on the 4651.351.043 spur gear.
• Intermittent gear slipping in forward ranges: When the spur gear loses tooth profile integrity, the transmission may momentarily lose power transfer, causing erratic engagement in WG100 series units.
• Metal particles in transmission fluid: Advanced wear releases ferrous debris into the oil system, often detected during routine drain intervals. This symptom frequently accompanies failure of the 0634303928: O-RING seals.
• Vibration at specific RPM bands: Uneven tooth wear creates harmonic imbalances, felt as chassis vibration between 1500-2200 RPM in vehicles equipped with WG100 transmissions.

Technical Specifications

Compatibility

This spur gear is engineered for the ZF WG100 series transmission family. It is directly compatible with WG100, WG120, and WG150 models produced after 2010. The 4651.351.043 also fits select WG180 and WG200 variants when used with the correct 4651301029: HOUSING adapter. For WG200 applications, verify the countershaft spline count matches the gear bore. The part is not interchangeable with older WG80 or WG90 series units without replacing the 4651301024: HOUSING assembly.

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