Overview
The ZF 4168.030.125 CONVERTER Torque Converter Assembly is a complete, direct-replacement unit engineered for the WG 150 Series transmission family. As the critical hydraulic coupling between the engine and gearbox, this torque converter assembly modulates power transfer, multiplies torque during launch, and dampens driveline vibrations. The SKU 4168.030.125 denotes a fully assembled converter, including the impeller, turbine, stator, and lock-up clutch, ready for installation. This component sits directly on the input shaft of the transmission, housed within the bell housing, and interfaces with the TRANSMISSION HOUSING to ensure precise alignment and oil flow.
Symptoms of Failure
When the ZF 4168.030.125 torque converter begins to fail, operators typically notice these distinct warning signs:
- Shudder or vibration during lock-up: A noticeable shaking when the converter clutch engages, often felt in the seat or steering wheel at highway speeds.
- Delayed or harsh engagement: A pronounced lag or “clunk” when shifting from Park to Drive or Reverse, indicating worn internal clutch plates or damaged stator bearings.
- Overheating transmission fluid: Persistent high-temperature warnings or burnt-smelling ATF, caused by internal slippage and reduced hydraulic efficiency within the converter assembly.
- Torque converter drain-back noise: A whining or grinding sound from the bell housing area, especially on cold starts, signaling failed needle bearings or a cracked turbine hub.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4168.030.125 |
| Overall Diameter | ~340 mm (13.4 in) |
| Pilot Diameter | ~45 mm (1.77 in) |
| Mounting Bolt Pattern | 6-bolt, 10.9 grade |
| Dry Weight | ~14.5 kg (32.0 lbs) |
| Housing Material | Cast aluminum with steel impeller |
| Lock-up Clutch Type | Friction-lined, hydraulic piston |
| OEM Reference | ZF 4168.030.125 |
Compatibility
This torque converter assembly is primarily designed for the ZF WG 150 Series transmissions. It is also compatible with the following ZF model families that share the same bell housing pattern and input spline geometry:
- ZF WG 150 (all sub-variants)
- ZF WG 180 (with adapter plate verification)
- ZF WG 200 (early production runs)
- ZF Ecomat 4HP/5HP series (when using specific flexplate kits)
During installation, ensure the TRANSMISSION HOUSING is free of cracks and that the TYPE PLATE is legible for correct model identification. The GROOVED STUD must be torqued to factory specifications to prevent oil leaks at the converter-to-flexplate interface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Encloses and aligns the torque converter and gearset |
| 4642301207 | TRANSMISSION HOUSING | Alternate housing variant for WG 150 series |
| 0730365067 | TYPE PLATE | Identification plate for transmission model and serial number |
| 0631311009 | GROOVED STUD | Locating dowel for converter-to-flexplate alignment |
| 4642301168 | SCREEN SHEET | Fine mesh filter for transmission oil sump |
| 4642301169 | SCREEN SHEET | Secondary oil strainer for high-flow circuits |
| 0636100621 | HEXAGON SCREW | Mounting bolt for converter housing cover |
| 4642301186 | SCREEN SHEET | Pre-filter for torque converter charge circuit |
| 4644106300 | SHIFT SYSTEM | Hydraulic valve body assembly for gear selection |
| 4644306500 | COVER PLATE | Protective shield over converter access port |
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