Overview
The ZF 4166.030.104 CONVERTER Torque Converter Assembly is a critical hydraulic coupling component that transfers engine torque to the transmission input shaft while multiplying rotational force during low-speed operation. Designed as a complete unit, this part sits between the engine flywheel and the transmission pump, converting mechanical energy into fluid power for smooth gear engagement. The SKU 4166.030.104 is engineered to exact OEM tolerances, ensuring minimal power loss and consistent performance in heavy-duty industrial applications. When installed alongside the 4644101080: TRANSMISSION HOUSING, it forms the core of the torque multiplication system within ZF WG-series transmissions.
Symptoms of Failure
- Torque converter shudder or vibration during acceleration — A worn 4166.030.104 unit often produces rhythmic shuddering, especially when climbing grades or under load, indicating degraded stator or clutch friction material.
- Transmission fluid overheating and darkening — Internal wear in the converter assembly generates excessive heat, causing ATF to break down rapidly and emit a burnt odor, a common sign of stator bearing failure.
- Delayed engagement or slipping in forward/reverse gears — When the torque converter fails to lock up properly, operators experience hesitation when shifting from neutral to drive, often accompanied by elevated stall speeds.
- Visible oil leaks near the bell housing area — A cracked converter hub or failed seal allows transmission fluid to escape, leaving puddles under the vehicle and requiring immediate inspection of the 4644301333: HOUSING for collateral damage.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.030.104 |
| Type | Complete Torque Converter Assembly |
| Outer Diameter | 340 mm (estimated) |
| Overall Length | 185 mm (estimated) |
| Weight | 14.2 kg (31.3 lbs) |
| Housing Material | Cast Aluminum Alloy |
| Impeller/Stator Material | Heat-Treated Steel |
| OEM Reference | ZF 4166.030.104 |
| Torque Capacity | Up to 1,200 Nm (estimated) |
Compatibility
This torque converter assembly is specifically designed for ZF WG 180 Series and WG 201 Series transmissions. It is also compatible with select WG 200 Series variants that share the same bell housing bolt pattern and pump drive geometry. For proper fitment, verify that the 0730365125: TYPE PLATE on your transmission matches the OEM specifications for the 4166.030.104. Additionally, the 0631311009: GROOVED STUD must be inspected during installation to ensure secure mounting of the converter to the flywheel.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101080 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4644301333 | HOUSING | Secondary housing for torque converter and pump assembly |
| 0730365125 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Secures torque converter to flywheel with anti-rotation groove |
| 0636305019 | SCREW PLUG | Seals fluid passages in the converter housing |
| 4644301247 | THREADED BUSH | Provides threaded mounting point for converter cover |
| 0634303485 | O-RING | Prevents fluid leaks between converter and housing |
| 4644106231 | SHIFT SYSTEM | Controls hydraulic pressure for gear selection |
| 4644306470 | GASKET | Seals mating surfaces between converter and transmission |
| 4644306194 | COVER PLATE | Protects converter access opening on transmission housing |
