ZF 4642.107.403 SPEEDOMETER for WG150 | OEM Genuine Part

Overview

The ZF 4642.107.403 SPEEDOMETER is a precision-engineered OEM genuine component designed specifically for the WG 150 series transmission. This critical sensor measures output shaft rotational speed, converting mechanical motion into an electrical signal that drives the vehicle’s speedometer and supports transmission control unit (TCU) shift logic. Positioned within the rear housing assembly, the SKU 4642.107.403 interfaces directly with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING to ensure accurate data transmission. Without this part, the transmission cannot provide reliable vehicle speed feedback, leading to improper gear selection and reduced drivability.

Symptoms of Failure

• Erratic or non-functional speedometer – The most common failure sign is a speedometer that fluctuates wildly, drops to zero, or remains stuck, often accompanied by a check engine light. This occurs when the internal magnetic pickup or gear train wears out.
• Harsh or delayed gear shifts – A failing speedometer sensor sends incorrect speed data to the TCU, causing the transmission to shift at wrong RPMs, resulting in jarring engagements or hesitation between gears.
• Transmission slipping in higher gears – Without accurate speed input, the TCU may fail to lock the torque converter properly, leading to noticeable slipping during highway cruising or under load.
• Oil seepage around the sensor mounting point – Worn O-rings or housing cracks allow transmission fluid to leak past the speedometer, leaving puddles under the vehicle and reducing hydraulic pressure.

Technical Specifications

Compatibility

While the 4642.107.403 is primarily designed for the WG 150 series, its mounting pattern and signal output are shared across several ZF heavy-duty transmissions. This speedometer is compatible with the WG 150, WG 180, and WG 200 models, as well as certain variants of the WG 120 series. It also fits select Ecomat 4HP and 5HP units when used with the appropriate 0730365125: TYPE PLATE adapter. For secure installation, pair this sensor with the 0631311009: GROOVED STUD to prevent vibration loosening. Always verify your transmission’s housing casting number before ordering.

Related Components

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