Overview
The ZF 4166.035.179 CONVERTER Torque Converter Assembly is a complete, drop-in replacement unit engineered for the WG 200 Series transmission family. This critical component sits between the engine flywheel and the transmission input shaft, serving as the primary hydraulic coupling that multiplies engine torque during launch and provides smooth power transfer during gear shifts. The SKU 4166.035.179 represents a fully assembled torque converter, including the impeller, turbine, stator, and lock-up clutch mechanism, ensuring direct replacement without the need for disassembly or core balancing. In the WG 200 Series, this converter works in concert with the 4644105414 DISCONNECTION unit to manage clutch engagement, and it mounts directly to the 4644101222 TRANSMISSION HOUSING for precise alignment.
Symptoms of Failure
When the ZF 4166.035.179 torque converter begins to wear, operators typically notice these specific failure indicators:
- Shudder or vibration during lock-up: A pronounced shaking sensation when the converter clutch engages, often described as “torque converter shudder” in heavy-duty applications.
- Delayed or harsh engagement: A noticeable lag between shifting from neutral to drive or reverse, accompanied by a hard “clunk” as the converter fills with fluid.
- Transmission fluid overheating: Persistent high-temperature warnings or burnt-smelling ATF, indicating the stator or lock-up clutch is slipping excessively.
- Stall speed deviation: Engine RPM at full stall (brake applied, throttle open) differs by more than 200 RPM from factory specifications, pointing to worn turbine or impeller blades.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.035.179 |
| Assembly Type | Complete Torque Converter with Lock-Up Clutch |
| Overall Diameter | ~340 mm (13.4 in) |
| Mounting Bolt Pattern | 6-bolt, 180 mm PCD |
| Weight | ~18.5 kg (40.8 lbs) |
| Primary Material | Cast Aluminum Housing, Steel Turbine/Impeller |
| OEM Reference | ZF 4166.035.179 (Direct Replacement) |
| Fluid Capacity | ~1.2 L (0.32 gal) ATF |
Compatibility
This torque converter assembly is specifically designed for the ZF WG 200 Series transmissions, including the WG180, WG200, and WG210 models commonly found in medium-duty trucks, buses, and off-highway equipment. It is also compatible with earlier WG 180 variants that share the same bellhousing pattern and input shaft spline count. For proper installation, ensure the 4644303409 OUTPUT FLANGE is in good condition, and use the specified 0636021083 HEXAGON SCREW fasteners to secure the converter to the flexplate. Always verify the transmission housing part number—either 4644301226 TRANSMISSION HOUSING or the earlier 4644101222 TRANSMISSION HOUSING—to confirm bolt alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105414 | DISCONNECTION | Clutch disconnection unit for torque converter lock-up control |
| 4644303409 | OUTPUT FLANGE | Flange connecting converter output to transmission input shaft |
| 0636021083 | HEXAGON SCREW | Fastener for mounting converter to flexplate |
| 4644101222 | TRANSMISSION HOUSING | Main housing for WG 200 series transmission |
| 4644301226 | TRANSMISSION HOUSING | Alternate housing variant for later WG 200 models |
| 0730365067 | TYPE PLATE | Identification plate for transmission model and serial number |
| 0631311009 | GROOVED STUD | Alignment stud for converter-to-housing positioning |
| 4644301298 | COVER PLATE | Protective cover for converter access opening |
| 0634306525 | O-RING | Seal between converter hub and pump housing |
| 0636305026 | SCREW PLUG | Drain or fill plug for converter fluid cavity |
