ZF 4108.301.428 INPUT SHAFT for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4108.301.428 INPUT SHAFT is a critical torque-transfer component engineered for the WG100, WG130, and WG131 series transmissions. Positioned at the front of the gearbox, this OEM genuine shaft receives rotational force directly from the engine clutch or torque converter and delivers it to the countershaft and main drive gears. Precision-ground splines and hardened bearing journals ensure minimal backlash and long service life under heavy-duty cycles. The SKU 4108.301.428 is the direct replacement for the original factory part, guaranteeing exact fitment and load capacity.

Symptoms of Failure

• Hard shifting or gear engagement delay: Worn splines on the input shaft cause hesitation when selecting forward or reverse gears, especially under load.
• Transmission oil leaks at the bell housing: A damaged shaft seal surface or excessive radial play forces oil past the front seal, leaving puddles under the vehicle.
• Metallic grinding or whining noise in neutral: Bearing race wear on the shaft produces a high-pitched sound that intensifies with engine RPM, indicating imminent failure.
• Vibration through the clutch pedal or floorboard: An unbalanced or bent input shaft creates rhythmic shaking that worsens during acceleration.

Technical Specifications

Compatibility

This input shaft is designed for ZF WG100, WG130, and WG131 transmissions. It also fits select variants of the WG180 and WG200 series when used with the correct 4108101074 HOUSING and 4108201252 HOUSING. Always verify the spline count and pilot bearing bore before installation. For complete sealing, pair this shaft with the 4108301304 BEARING COVER and a fresh 4108306173 GASKET to prevent contamination.

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