ZF 4644.323.012 COUPLING FLANGE for WG200 | OEM Genuine Part

Overview

The ZF 4644.323.012 COUPLING FLANGE is a critical drivetrain component engineered specifically for the WG 200 series transmission. This OEM genuine part serves as the primary mechanical interface between the transmission output shaft and the downstream driveshaft assembly, ensuring precise torque transfer and rotational alignment. The SKU 4644.323.012 is manufactured to ZF’s exacting tolerances, featuring a splined bore that mates directly with the output shaft while providing a robust mounting surface for the companion flange. In the WG200 power flow path, this coupling flange sits immediately after the output seal housing, acting as the final rotational link before power reaches the axle or transfer case.

Symptoms of Failure

When the ZF 4644.323.012 coupling flange begins to wear, operators typically notice driveline vibration during acceleration due to spline wear or flange face runout. A second common symptom is transmission fluid seepage around the output seal area, as a worn flange surface can damage the seal lip. Third, intermittent clunking noises during gear engagement often indicate excessive backlash between the flange splines and the output shaft. Finally, visible corrosion or pitting on the flange mating surface can lead to improper bolt torque retention, compromising the entire driveline connection.

Technical Specifications

Compatibility

This coupling flange is primarily designed for the ZF WG200 series transmission, but it also fits select variants of the WG180 and WG211 models that share the same output shaft spline geometry. The 4644.323.012 is commonly found in medium-duty commercial vehicles, municipal trucks, and off-highway equipment equipped with ZF’s WG200 family. Always verify the output shaft spline count and pilot diameter before installation, as later WG200 revisions may use a different flange pattern.

Related Components

When replacing the 4644.323.012 coupling flange, several companion parts should be inspected simultaneously. The 4460165051: CONSOLE provides structural support for the transmission mount, while the 4460368311: CONSOLE serves a similar role on the opposite side. Secure fastening is achieved using the 0636011429: HEXAGON SCREW and the 0730100365: WASHER, both of which must be replaced to maintain proper clamp load. For complete driveline restoration, consider the 4644105418: DISCONNECTION unit and the 4644305041: ADAPTER for auxiliary PTO integration.