ZF 4644.309.004 OUTPUT FLANGE for WG180 | OEM Genuine Part

Overview

The ZF 4644.309.004 OUTPUT FLANGE is a critical driveline component engineered for the WG 180 series transmission. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the driveshaft, transferring rotational torque from the gearbox to the vehicle’s axles. Constructed from high-strength forged steel, the flange ensures precise alignment and secure coupling under heavy load conditions. The SKU 4644.309.004 is machined to exact ZF tolerances, guaranteeing a direct fit without modification. It sits at the rear of the transmission housing, directly engaging with the output shaft splines and sealed by an O-ring to prevent contamination.

Symptoms of Failure

• Transmission fluid leakage at the rear seal: A worn output flange can damage the sealing surface, causing oil to drip from the bell housing area. This often appears as wetness around the driveshaft connection.
• Vibration during acceleration or deceleration: When the flange splines wear or the flange becomes unbalanced, driveline shudder occurs, particularly between 30-50 mph.
• Clunking noise when shifting between drive and reverse: Excessive play in the flange splines creates a metallic knock as torque is applied, indicating imminent failure.
• Driveshaft misalignment or wobble: A bent or cracked output flange causes visible oscillation of the driveshaft, leading to premature U-joint wear.

Technical Specifications

Compatibility

This output flange is primarily designed for the ZF WG 180 series transmission, commonly found in medium-duty trucks, buses, and construction equipment. It also fits the WG 200 and WG 150 series when used with the correct pilot bearing. The part is compatible with ZF models manufactured between 2005 and 2020. Always verify spline count and bolt pattern against your existing flange before installation.

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