ZF 5838.300.158 INNER GEAR RING for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 5838.300.158 INNER GEAR RING is a precision-machined component engineered for the planetary gear sets within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part functions as the internal splined ring that meshes directly with planetary pinions, transferring torque from the sun gear to the output shaft while maintaining proper gear alignment. As a critical element of the gear train, the SKU 5838.300.158 ensures smooth power flow and load distribution across the transmission assembly. When installed alongside the 5838109007: DIFFERENTIAL, this inner gear ring forms the core of the final drive reduction system.

Symptoms of Failure

When the ZF 5838.300.158 inner gear ring begins to fail, operators typically notice these specific performance issues:

• Whining or grinding noise during acceleration: Worn gear teeth create a high-pitched whine that intensifies under load, often mistaken for bearing failure.
• Intermittent gear slippage under heavy torque: The ring loses its ability to hold the planetary gears, causing momentary loss of drive power when climbing or hauling.
• Metallic debris in transmission fluid: Flaking or chipped teeth produce visible metal particles during routine oil changes, indicating advanced wear.
• Vibration at specific RPM ranges: Uneven tooth contact generates harmonic vibrations that resonate through the driveline at highway speeds.

Technical Specifications

Compatibility

This inner gear ring is specifically designed for ZF WG-series transmissions. Verified compatible models include:

• ZF WG100 – All variants (standard and heavy-duty)
• ZF WG130 – Series A and B configurations
• ZF WG131 – With integrated differential housing
• ZF WG180 – When used with 0750117075: TAPER ROLLER BEARING for shaft support
• ZF WG200 – Requires 2095209019: DIFFERENTIAL for complete assembly

Always verify your transmission serial number before installation. The 0631329086: SPRING PIN is required for securing this ring to the planetary carrier hub.

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