ZF 5838.300.134 DIFFERENTIAL BEVEL GEAR for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 5838.300.134 DIFFERENTIAL BEVEL GEAR is a precision-machined component engineered for the WG100, WG130, and WG131 series transmissions. This OEM genuine part functions as the primary torque-transfer interface between the differential carrier and the axle shafts, converting rotational power from the driveshaft into lateral motion for the wheels. As a critical element within the final drive assembly, the SKU 5838.300.134 works in concert with the DIFFERENTIAL unit to ensure smooth power distribution under heavy loads. It is housed directly within the DIFFERENTIAL HOUSING, where it meshes with the axle bevel gears to manage speed differentials during turns.

Symptoms of Failure

• Whining or howling noise from the rear axle during acceleration: When the bevel gear teeth wear unevenly, a distinct high-pitched whine becomes audible, particularly at speeds above 30 mph. This is a classic sign of gear face pitting or scoring.
• Vibration through the chassis during cornering: A worn differential bevel gear causes intermittent engagement with the REAR AXLE assembly, leading to noticeable shuddering or vibration when turning, especially under load.
• Metallic debris in the differential fluid: Flakes or silver-colored particles in the gear oil indicate that the bevel gear’s hardened surface is spalling. This accelerates wear on the TAPER ROLLER BEARING and other internal components.
• Intermittent gear slipping or clunking: A sudden clunk when shifting from drive to reverse suggests excessive backlash between the bevel gear and its mating pinion, often caused by tooth breakage or severe wear.

Technical Specifications

Compatibility

This differential bevel gear is specifically designed for ZF WG100, WG130, and WG131 heavy-duty transmissions. It is a direct-fit replacement for models built between 2005 and 2020, including the WG100-5, WG130-7, and WG131-9 variants. The gear is also compatible with select ZF rear axle assemblies that utilize a 14-tooth spiral bevel pinion. For verification, always cross-reference your transmission serial number with the OEM part number 5838.300.134. This component is not interchangeable with the WG180 or WG200 series due to differences in tooth pitch and shaft diameter.

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