ZF 4661.105.010 COUPLING for WG 90/WG 94 | OEM Genuine Part

Overview

The ZF 4661.105.010 COUPLING is a critical torque-transfer component engineered specifically for the WG 90 and WG 94 series transmissions. This OEM genuine part sits between the engine output flange and the transmission input shaft, serving as the primary mechanical link that absorbs torsional vibrations and ensures smooth power delivery. The SKU 4661.105.010 is precision-machined to maintain exact alignment within the drivetrain, preventing axial play that can lead to premature wear on adjacent assemblies. When installed alongside the 4661101021 TRANSMISSION HOUSING, this coupling forms the core of the torque path, making it indispensable for heavy-duty industrial applications.

Symptoms of Failure

• Transmission oil leaks near the bell housing: A worn 4661.105.010 coupling can cause seal misalignment, leading to fluid seepage that contaminates the clutch area and reduces hydraulic pressure.
• Gear slipping under load: When the coupling splines degrade, the transmission may momentarily lose torque transfer, especially during uphill climbs or when carrying maximum payload.
• Abnormal vibration at specific RPM ranges: A fatigued coupling loses its dampening capacity, transmitting engine harmonics directly into the 4661301047 HOUSING II, which manifests as a low-frequency shudder between 1200-1800 RPM.
• Metallic grinding noise during gear engagement: Excessive clearance from a worn coupling allows the input shaft to contact the 4661301093 TUBE, producing a distinct scraping sound that worsens over time.

Technical Specifications

Compatibility

This coupling is a direct fit for the ZF WG 90 and WG 94 transmission series, commonly found in mid-range trucks, buses, and construction equipment. It also serves as a replacement part for the WG 180, WG 200, and WG 250 models when used with the correct 0631306174 CYLINDRICAL PIN for alignment. The 4661.105.010 is not compatible with WG 120 or WG 150 series without adapter modifications. Always verify the spline count (typically 24 teeth) against your existing unit before installation.

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