ZF 4642.303.104 INPUT GEAR for WG150 | OEM Genuine Part

Overview

The ZF 4642.303.104 Input Gear is a critical power-transfer component engineered specifically for the WG 150 series transmission. Positioned at the front of the main shaft assembly, this OEM genuine part receives rotational force directly from the torque converter and distributes it through the planetary gear sets. Precision-machined from case-hardened alloy steel, the 4642.303.104 ensures minimal backlash and optimal load distribution under high-torque conditions. When replacing this gear, it is essential to inspect the TRANSMISSION HOUSING (4642101108) and the TRANSMISSION HOUSING (4642301208) for wear, as housing alignment directly affects gear mesh patterns.

Symptoms of Failure

• Whining or howling noise during acceleration: Worn gear teeth create irregular contact patterns, producing a distinct high-pitched sound that intensifies under load.
• Delayed engagement or gear slipping: Excessive clearance between the input gear and mating components causes intermittent power loss, especially when shifting from neutral to drive.
• Metallic debris in transmission fluid: Flaking or pitting on the gear surface contaminates the oil, often visible as silver particles on the dipstick or in the pan.
• Vibration through the driveline: A damaged input gear introduces rotational imbalance, felt as a rhythmic shudder at specific RPM ranges.

Technical Specifications

Compatibility

This input gear is primarily designed for the ZF WG 150 series, but it also serves as a direct replacement in the WG 180 and WG 200 models due to shared shaft diameters and spline counts. It is not compatible with the WG 120 or WG 250 series, which use different tooth profiles. Always verify the TYPE PLATE (0730365125) on your transmission to confirm model designation before ordering. The GROOVED STUD (0631311009) must be torqued to specification when securing this gear to the input shaft.

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