ZF 4108.301.475 INPUT SHAFT for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4108.301.475 INPUT SHAFT is a critical torque-transfer component engineered for the WG100, WG130, and WG131 series transmissions. As the primary interface between the engine’s clutch or torque converter and the transmission gearset, this OEM genuine shaft ensures precise rotational alignment and power delivery. The SKU 4108.301.475 is machined from high-strength alloy steel to withstand the torsional loads and cyclic stresses common in heavy-duty commercial applications. This input shaft interfaces directly with the 4108101066 HOUSING and the 4108201298 HOUSING, forming the core rotating assembly that drives the planetary gear sets.

Symptoms of Failure

• Transmission gear slipping under load: A worn input shaft spline or bearing journal can cause intermittent power loss, especially during acceleration or hill climbing.
• Persistent transmission fluid leaks at the front housing: Deterioration of the shaft’s sealing surface often leads to oil weeping past the 0501325471 SEALING RING, resulting in low fluid levels and potential overheating.
• Abnormal grinding or whining noise from the bell housing area: Excessive radial play from a worn input shaft can create metal-on-metal contact with the housing or bearing races.
• Difficulty engaging or disengaging gears: A bent or twisted input shaft disrupts the synchromesh timing, making shifts feel notchy or requiring excessive force.

Technical Specifications

Compatibility

This input shaft is specifically designed for ZF’s WG-series powershift transmissions. It is a direct fit for the WG100, WG130, and WG131 models. While the shaft geometry is unique to these three variants, it may also be compatible with early WG180 units that share the same input housing configuration. Always verify the spline count and bearing seat dimensions against your transmission’s serial number. For accurate fluid level monitoring during installation, use the 0501215601 OIL LEVEL GAGE to ensure proper lubrication of the shaft and bearings.

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