ZF 5838.300.823 SPUR GEAR for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 5838.300.823 SPUR GEAR is a critical power transmission component engineered for the WG100, WG130, and WG131 series transmissions. This OEM genuine part functions as a primary drive gear within the planetary gearset, transferring torque from the input shaft to the differential assembly. The SKU 5838.300.823 is precision-machined to maintain exact tooth engagement, ensuring smooth power flow and minimal backlash during high-load operations. When installed alongside the 5838109021 DIFFERENTIAL, this spur gear forms the core of the final drive reduction unit, directly influencing vehicle acceleration and towing capacity.

Symptoms of Failure

• Whining or howling noise during acceleration: Worn gear teeth on the 5838.300.823 produce a distinct high-pitched whine that intensifies under load, often misdiagnosed as bearing failure.
• Metallic debris in transmission fluid: Pitting or spalling on the gear flanks generates fine metal particles, visible during fluid changes or when inspecting the 0750117075 TAPER ROLLER BEARING assembly.
• Intermittent gear slippage under torque: Excessive clearance between the spur gear and mating components causes momentary loss of drive, particularly during uphill climbs or when towing heavy loads.
• Vibration in the driveline: Uneven tooth wear creates cyclic vibration felt through the chassis, accelerating wear on the 2095209019 DIFFERENTIAL and associated bearings.

Technical Specifications

Compatibility

This ZF 5838.300.823 spur gear is specifically designed for the WG100, WG130, and WG131 transmission families. It is also compatible with select variants of the WG180 and WG200 series when used with the correct 0631329086 SPRING PIN for shaft retention. The gear interfaces directly with the differential pinion shaft and requires proper shimming using thrust washers such as the 5838300817 THRUST WASHER and 5838300682 DIFFERENTIAL AXLE for correct end-play. Always verify transmission serial numbers before ordering.

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