ZF 4616.108.018 COUNTERSHAFT for WG65 | OEM Genuine Part

Overview

The ZF 4616.108.018 COUNTERSHAFT is a critical internal component engineered for the WG 65 Series transmission family. This genuine OEM part serves as the primary torque-transfer shaft, meshing directly with multiple gear sets to facilitate smooth ratio changes under heavy load. Located within the main gear cluster, the countershaft (SKU: 4616.108.018) ensures precise alignment of rotating elements, directly influencing shift quality and overall drivetrain efficiency. It is typically secured within the 4616101066: TRANSMISSION HOUSING and works in concert with the 4616301307: HOUSING to maintain structural integrity under extreme torque.

Symptoms of Failure

• Gear Slipping Under Load: Worn splines or bearing journals on the countershaft cause intermittent disengagement, especially during uphill hauls or high-torque acceleration.
• Abnormal Gear Whine or Grinding: A failing countershaft produces a distinct, high-pitched whine that escalates to a grinding noise as the shaft surface degrades.
• Metal Particles in Transmission Fluid: Flaking or spalling from the hardened shaft surface contaminates the oil, often visible during routine drain intervals.
• Hard Shifting or Gear Lockout: Misalignment due to a bent or worn countershaft prevents smooth engagement, requiring excessive force to shift.

Technical Specifications

Compatibility

This countershaft is specifically designed for the ZF WG 65 Series transmissions, including models such as WG65, WG80, WG100, WG120, WG150, WG180, and WG200. It is a direct replacement for OEM assemblies where the shaft interfaces with the 4616301309: HOUSING and is retained by 0636011118: HEXAGON SCREW fasteners. Always verify your transmission model suffix before installation.

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