ZF 4616.308.031 COUNTERSHAFT for WG65 | OEM Genuine Part

Overview

The ZF 4616.308.031 COUNTERSHAFT is a critical internal component designed specifically for the WG 65 Series transmission. This genuine OEM part serves as the primary torque-transferring shaft within the gear train, working in conjunction with the TRANSMISSION HOUSING to maintain precise gear alignment and rotational stability. As the central axis for multiple gear clusters, the countershaft ensures smooth power distribution from the input to the output shaft. The SKU 4616.308.031 is manufactured to ZF’s exacting tolerances, guaranteeing long service life in heavy-duty commercial applications.

Symptoms of Failure

• Gear grinding or hard shifting: A worn countershaft often causes misalignment between gear pairs, leading to audible grinding noises during gear engagement or difficulty moving the shift lever into position.
• Vibration under load: When the countershaft bearings or splines degrade, operators may notice excessive driveline vibration, particularly when accelerating or climbing grades.
• Oil contamination with metallic debris: Flaking or spalling on the countershaft surface introduces fine metal particles into the transmission fluid, visible during routine oil changes as glitter or sludge.
• Intermittent power loss: A cracked or fatigued countershaft can cause sudden torque interruption, often misdiagnosed as clutch or synchronizer failure.

Technical Specifications

Compatibility

This countershaft is engineered for the ZF WG 65 Series transmission family. It is directly compatible with the following models: WG65, WG80, WG100, WG120, WG150, WG180, and WG200. The 4616.308.031 also fits select WG 65 variants used in municipal buses, refuse trucks, and medium-duty construction vehicles. Always verify the transmission serial number before ordering, as minor revisions exist between early and late production units.

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