Overview
The ZF 4168.028.379 CONVERTER Torque Converter Assembly is a complete, ready-to-install unit designed to manage hydraulic torque multiplication and lock-up within ZF WG 90 and WG 94 series transmissions. This critical component sits between the engine flywheel and the transmission input shaft, converting rotational energy into hydraulic power to smoothly transfer torque to the gearset. The SKU 4168.028.379 replaces worn or damaged converters to restore driveline efficiency and prevent premature wear on adjacent components such as the 4661101031: TRANSMISSION HOUSING and the 4661301046: HOUSING II.
Symptoms of Failure
- Shuddering or vibration during acceleration: A failing torque converter often causes noticeable shuddering, especially at highway speeds, as the lock-up clutch slips or the stator fails to redirect fluid properly.
- Transmission overheating and fluid discoloration: Worn internal seals or a damaged impeller can generate excessive heat, leading to dark, burnt-smelling transmission fluid and potential damage to the 4661301093: TUBE assembly.
- Delayed or harsh engagement: When the converter fails to build adequate hydraulic pressure, you may experience a noticeable lag when shifting from Park to Drive or Reverse, often accompanied by a hard clunk.
- Whining or grinding noise from the bell housing: Worn needle bearings or a cracked turbine hub produce a distinct whining sound that increases with engine RPM, signaling imminent converter failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4168.028.379 |
| Type | Complete Torque Converter Assembly |
| Outer Diameter | ~340 mm (estimated) |
| Overall Length | ~180 mm (estimated) |
| Weight | ~18.5 kg (estimated) |
| Housing Material | High-strength steel with hardened impeller |
| OEM Reference | ZF 4168.028.379 |
| Lock-up Clutch | Integrated friction disc |
| Fluid Capacity | ~1.2 liters (estimated) |
Compatibility
This torque converter assembly is engineered for ZF WG 90 and WG 94 series transmissions, including models such as the WG180, WG200, and WG210. It is also compatible with certain WG 92 variants used in industrial and agricultural equipment. Always verify the bell housing pattern and pilot diameter against your specific transmission model. When replacing this unit, inspect the 0631306174: CYLINDRICAL PIN for wear, as it aligns the converter to the flywheel.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101031 | TRANSMISSION HOUSING | Encloses and supports the gear train and converter assembly |
| 4661301046 | HOUSING II | Secondary housing for oil distribution and valve body mounting |
| 4661301093 | TUBE | Oil feed tube for converter lubrication and cooling |
| 0631306174 | CYLINDRICAL PIN | Alignment pin for converter-to-flywheel positioning |
| 0769123894 | TYPE PLATE | Identification plate for transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals oil passages in the transmission housing |
| 0636302602 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0634100633 | O-RING | Seals converter hub to pump interface |
| 4661301041 | NOZZLE | Oil spray nozzle for gear lubrication |
| 4661301038 | NOZZLE | Secondary oil spray nozzle for clutch pack cooling |
