ZF 4646.102.410 INPUT for WG251 | OEM Genuine Part

Overview

The ZF 4646.102.410 INPUT for WG251 is a critical OEM genuine component engineered to transfer rotational force from the torque converter directly into the planetary gear set of ZF’s WG series transmissions. Positioned at the front of the main shaft assembly, this input shaft (SKU: 4646.102.410) absorbs high-torque loads and ensures precise alignment during gear engagement. Manufactured to ZF’s exacting tolerances, it is a direct replacement part designed to restore factory performance in heavy-duty drivetrains. When paired with a robust TRANSMISSION HOUSING (4646101072), this input shaft maintains the structural integrity required for continuous industrial operation.

Symptoms of Failure

• Hard shifting or delayed engagement — A worn input shaft spline can cause hesitation when selecting forward or reverse gears, often accompanied by a grinding noise.
• Transmission fluid leaks near the bell housing — Deterioration of the shaft seal surface leads to oil weeping, which may be visible as drips under the vehicle or machine.
• Vibration during acceleration — Excessive play in the input shaft bearing journal creates harmonic vibrations that intensify under load, indicating imminent failure.
• Intermittent gear slipping — When the shaft loses its interference fit with the clutch hub, the transmission may momentarily lose power transfer under heavy torque.

Technical Specifications

Compatibility

This input shaft is specifically designed for the ZF WG 251 Series transmissions, which are commonly found in medium-duty trucks, buses, and construction equipment. It is also compatible with the WG180, WG200, and WG210 models that share the same input shaft geometry and spline count. For proper installation, ensure the HOUSING (4646301201) is free of cracks and the COVER (4646301166) is torqued to specification using a CAP SCREW (0636101051) to prevent oil migration.

Related Components