ZF 4644.323.014 GEAR SHIFT FORK for WG200 | OEM Genuine Part

Overview

The ZF 4644.323.014 GEAR SHIFT FORK is a precision-machined component engineered specifically for the WG200 series transmission. This OEM genuine part, identified by SKU 4644.323.014, slides along the shift rail to engage and disengage gear synchronizers, directing power flow through the drivetrain. It sits within the upper valve body area of the transmission housing, interfacing directly with the shift mechanism to ensure crisp, accurate gear selection. As a critical wear item in heavy-duty commercial applications, this fork maintains the alignment of the shift collar during high-torque operations.

Symptoms of Failure

• Gear grinding during engagement: A worn shift fork pad or bent fork tine causes incomplete synchronizer contact, resulting in audible grinding when shifting into second or reverse gear.
• Intermittent gear slipping under load: When the fork loses its precise geometry, the shift collar may partially disengage, causing the transmission to pop out of gear on inclines or during acceleration.
• Hard shifting or stuck in gear: Deformation of the fork shaft bore creates binding on the shift rail, requiring excessive force to move the lever or leaving the transmission locked in one range.
• Metallic debris in transmission fluid: Worn fork pads shed fine metal particles that contaminate the oil, often visible during routine drain intervals as a silver sludge.

Technical Specifications

Compatibility

This gear shift fork is designed for ZF WG series transmissions, with primary fitment in the WG200 model. It is also compatible with the WG180 and WG210 variants that share the same shift rail spacing and fork geometry. The part is not backward-compatible with older ZF 4HP or 5HP series units. Always verify the shift fork pad profile against your existing component before installation.

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