Overview
The ZF 4661.172.002 COUPLING is a critical driveline component engineered specifically for the WG 90 and WG 94 series transmissions. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the downstream drive system, ensuring precise torque transfer and rotational alignment. Located within the rear housing assembly, the coupling absorbs torsional vibrations and compensates for minor misalignment during operation. The SKU 4661.172.002 is manufactured to ZF’s exacting tolerances, guaranteeing a direct replacement that restores factory performance. When paired with a robust 4661101013: TRANSMISSION HOUSING, this coupling maintains the structural integrity of the entire drivetrain.
Symptoms of Failure
- Driveline clunking or knocking during gear engagement: Worn coupling teeth or elastomeric elements create audible slack when shifting from neutral to drive or reverse.
- Vibration at highway speeds: A degraded coupling fails to dampen harmonics, transmitting excessive vibration through the chassis and steering wheel.
- Oil seepage near the output flange: Cracks in the coupling body or seal surface allow transmission fluid to escape, often noticed as drips under the vehicle after parking.
- Intermittent power loss under load: Slippage within the coupling assembly causes momentary disengagement when climbing grades or towing heavy loads.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4661.172.002 |
| Outer Diameter | 180 mm (estimated) |
| Inner Bore Diameter | 45 mm (estimated) |
| Overall Length | 95 mm (estimated) |
| Material | High-strength alloy steel with elastomeric insert |
| Weight | 2.8 kg (estimated) |
| OEM Reference | ZF 4661.172.002 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is designed for ZF’s WG series powershift transmissions, specifically the WG 90 and WG 94 models. It is also compatible with the WG 180 and WG 200 variants when used in conjunction with the correct 4661301022: HOUSING adapter. The part fits all production years of these models, including early and late revisions. For proper installation, ensure the 0631306174: CYLINDRICAL PIN is aligned correctly to prevent rotational misalignment. Always verify the 0769123894: TYPE PLATE on your transmission to confirm model designation before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101013 | TRANSMISSION HOUSING | Encloses and supports internal gear sets |
| 4661301022 | HOUSING | Rear housing adapter for coupling mounting |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise coupling positioning |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 0750100022 | SCREW PLUG | Seals oil passages in housing |
| 4660201008 | SCREW PLUG | Drain or fill port plug |
| 0636100117 | SCREW PLUG | Pressure test port plug |
| 0501211384 | VALVE | Hydraulic control valve for clutch modulation |
| 0732042156 | COMPRESSION SPRING | Provides return force for valve spools |
| 0636100820 | SCREW PLUG | High-pressure sealing plug |
