Overview
The ZF 4661.271.002 COUPLING is a critical torque-transfer component engineered specifically for the WG 90 and WG 94 series transmissions. This OEM genuine part, identified by SKU 4661.271.002, sits between the transmission housing and the output shaft assembly, ensuring precise rotational alignment and dampening torsional vibrations during high-load operations. Designed to withstand extreme thermal and mechanical stress, this coupling directly interfaces with the 4661101004: TRANSMISSION HOUSING and the 4661301004: HOUSING to maintain driveline integrity. Without this coupling, the transmission cannot reliably transfer power from the engine to the wheels in heavy-duty applications.
Symptoms of Failure
- Torque fluctuation under load: A worn 4661.271.002 coupling causes erratic power delivery, especially during acceleration or climbing, leading to “ZF transmission torque loss” or “gear hunting” conditions.
- Metallic grinding from the bell housing: As the coupling splines degrade, you may hear a distinct “ZF WG94 grinding noise” during gear engagement, indicating metal-on-metal contact.
- Oil contamination in the coupling area: A failing seal around this part allows transmission fluid to mix with debris, producing a “ZF coupling oil leak” that can be spotted near the output flange.
- Vibration at specific RPM ranges: Excessive play in the coupling creates “ZF transmission vibration at 1500 RPM,” often misdiagnosed as a driveshaft issue.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4661.271.002 |
| Material | High-tensile alloy steel with nitrided surface |
| Outer Diameter | 142 mm |
| Inner Diameter | 68 mm |
| Overall Length | 95 mm |
| Weight | 2.8 kg |
| OEM Reference | ZF 4661.271.002 |
| Torque Capacity | 1,200 Nm (peak) |
Compatibility
This coupling is factory-specified for the ZF WG 94 Series transmissions, including models WG94, WG94-2, and WG94-3. It is also mechanically compatible with the WG 90 Series (WG90, WG90-1) and select WG 180 and WG 200 variants that share the same output shaft geometry. Always verify spline count and pilot bore dimensions before installation. The coupling works in conjunction with the 4661301093: TUBE for lubrication routing and the 0631306174: CYLINDRICAL PIN for precise alignment during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101004 | TRANSMISSION HOUSING | Encloses gear train and supports coupling |
| 4661301004 | HOUSING | Rear output housing for WG series |
| 4661301093 | TUBE | Lubrication delivery channel |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for coupling installation |
| 0769123894 | TYPE PLATE | Identification label for transmission |
| 0750100022 | SCREW PLUG | Seals oil drain port |
| 0636302602 | SCREW PLUG | Magnetic plug for debris collection |
| 0634100633 | O-RING | Seals coupling-to-housing interface |
| 4661301029 | NOZZLE | Oil spray nozzle for gear cooling |
| 4661301027 | NOZZLE | Secondary oil jet for bearing lubrication |
