ZF 4644.351.026 SPUR GEAR for WG181 | OEM Genuine Part

Overview

The ZF 4644.351.026 SPUR GEAR is a precision-machined component engineered for the WG181 series transmission. This gear transfers rotational force between parallel shafts within the planetary gearset, directly influencing torque delivery and shift timing. As an OEM genuine part, SKU 4644.351.026 ensures exact tooth geometry and metallurgical properties required for long-term durability. It sits within the intermediate shaft assembly, where it meshes with adjacent gears to maintain synchronized power flow. Without this spur gear, the transmission cannot achieve proper gear engagement or load distribution.

Symptoms of Failure

• Whining or grinding noise during acceleration: Worn teeth on the 4644.351.026 spur gear create irregular contact patterns, producing audible metal-on-metal sounds that intensify under load.
• Intermittent gear slippage in WG181 units: As tooth profiles degrade, the gear loses positive engagement, causing the transmission to momentarily lose drive power before re-engaging.
• Metallic debris in transmission fluid: Flaking or chipped gear teeth shed particles into the oil, often visible during routine drain inspections or as sludge on the TRANSMISSION HOUSING interior.
• Vibration through the driveline: Uneven wear on the spur gear induces harmonic vibrations felt in the chassis, particularly at specific RPM ranges.

Technical Specifications

Compatibility

This spur gear is primarily designed for the ZF WG181 series. It also fits select variants of the WG180 and WG200 transmissions where the intermediate shaft gearset shares identical tooth geometry. Always verify spline count and shaft diameter before installation. The gear interfaces directly with the TRANSMISSION HOUSING and is secured using the THREADED BUSH and SCREW PLUG for axial retention. Do not substitute with non-OEM gears as tooth profile deviations can cause premature failure.

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