ZF 4644.305.020 OUTPUT SHAFT for WG200 | OEM Genuine Part

Overview

The ZF 4644.305.020 OUTPUT SHAFT is a critical torque-transmitting component engineered specifically for the WG 200 Series powershift transmissions. This OEM genuine part serves as the primary interface between the transmission’s planetary gearset and the driveline, converting rotational energy into usable mechanical power for heavy-duty industrial vehicles. Located within the rear section of the transmission housing, the output shaft interfaces directly with the 4644303547: OUTPUT FLANGE and the 4644303012: OUTPUT FLANGE to ensure precise alignment and minimal vibration. The SKU 4644.305.020 is manufactured to ZF’s original tolerances, guaranteeing a direct fit without modification.

Symptoms of Failure

• Transmission oil leaks at the rear seal: A worn output shaft often damages the lip seal, causing fluid to weep from the bell housing area—a common issue in high-hour WG200 units.
• Gear slipping under load: When the shaft splines wear or the bearing journal becomes scored, the transmission may lose torque transfer during acceleration, particularly in reverse or first gear.
• Abnormal driveline vibration: Excessive radial play in the output shaft leads to driveline shudder at highway speeds, often misdiagnosed as a U-joint problem.
• Metal debris in transmission fluid: Fretting wear on the shaft’s spline teeth generates fine metallic particles that contaminate the hydraulic circuit, accelerating failure of the 4644105417: DISCONNECTION assembly.

Technical Specifications

Compatibility

This output shaft is designed primarily for the ZF WG 200 Series transmissions, including the WG200, WG201, and WG202 variants. It also fits select WG180 models with matching output flange interfaces, though verification of the 4644101121: TRANSMISSION HOUSING casting number is recommended. The 4644.305.020 replaces superseded part 4644.305.010 and is not backward-compatible with early WG150 units. Always confirm spline engagement with the mating output flange before installation.

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