ZF 4644.307.011 SPEEDOMETER WORM for WG200 | OEM Genuine Part

Overview

The ZF 4644.307.011 SPEEDOMETER WORM is a precision-machined component engineered for the WG200 series transmission family. This OEM genuine part interfaces directly with the output shaft to drive the speedometer gear train, converting rotational motion into accurate vehicle speed data. Installed within the rear housing assembly, the worm gear (SKU: 4644.307.011) ensures seamless signal transmission to the dashboard instrumentation. For proper mounting, this component works in conjunction with the 4460165051: CONSOLE and the 4460368311: CONSOLE, which provide structural support within the transmission casing.

Symptoms of Failure

• Erratic speedometer needle fluctuation – When the worm gear teeth wear unevenly, the speedometer may jump or drop to zero intermittently during highway driving.
• Transmission oil seepage at the speedometer drive port – A worn worm shaft seal allows ATF fluid to leak past the housing, leaving puddles under the vehicle.
• Complete speedometer failure with no diagnostic codes – If the worm gear strips completely, the speedometer reads zero while the transmission shifts normally, often misdiagnosed as a sensor issue.
• Whining or grinding noise from the rear transmission housing – Metal-on-metal contact from a damaged worm gear produces a distinct high-pitched sound during acceleration.

Technical Specifications

Compatibility

This speedometer worm is primarily designed for the ZF WG200 series transmissions, including the WG180, WG200, and WG210 variants. It also fits select ZF Ecolife and Ecomat models that share the same speedometer drive architecture. Always verify the output shaft spline count and housing depth before installation. The worm gear interfaces with the 4644105418: DISCONNECTION mechanism and the 4644305041: ADAPTER to ensure proper alignment within the transmission housing.

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