Overview
The ZF 4168.034.078 CONVERTER Torque Converter Assembly is a critical hydraulic coupling unit positioned between the engine and the transmission gear train in the WG 211 Series. This complete unit transfers engine torque to the transmission input shaft while multiplying torque during initial acceleration. The SKU 4168.034.078 designates a fully assembled converter, including the impeller, turbine, stator, and lock-up clutch mechanism. It directly interfaces with the 4657120005: PRESSURE REGULATOR to maintain optimal hydraulic pressure for smooth power delivery.
Symptoms of Failure
- Shuddering or vibration during acceleration — Worn converter clutch friction material causes intermittent lock-up, leading to noticeable shudder at highway speeds.
- Transmission fluid overheating — A failing stator or damaged internal bearings reduce hydraulic efficiency, generating excessive heat and triggering warning lights.
- Delayed or harsh engagement — When the converter fails to build proper stall pressure, gear engagement becomes sluggish or abrupt, especially from a standstill.
- Torque converter drain-back noise — A worn one-way clutch allows fluid to drain back into the pan, producing a whining or grinding sound during cold starts.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4168.034.078 |
| Assembly Type | Complete Torque Converter Unit |
| Outer Diameter | ~340 mm (estimated) |
| Weight | ~18.5 kg (40.8 lbs) |
| Material | Steel impeller & turbine, aluminum stator |
| OEM Reference | ZF WG 211 Series |
| Lock-up Clutch | Integrated hydraulic lock-up |
Compatibility
This torque converter assembly is engineered for ZF WG 211 Series transmissions. It is also compatible with the WG180 and WG200 models when used with the correct 0501211384: VALVE for pressure modulation. Additional compatible series include the WG150 and WG250, provided the 0630532183: INDENTED RING and 4656306145: PISTON are verified for proper fitment. Always cross-reference your transmission model tag before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls hydraulic pressure to the converter |
| 0501211384 | VALVE | Modulates fluid flow for lock-up engagement |
| 0630532183 | INDENTED RING | Secures converter assembly within the housing |
| 4656306145 | PISTON | Actuates the lock-up clutch mechanism |
| 0732042767 | COMPRESSION SPRING | Provides return force for the piston |
| 0631612064 | SET SCREW | Adjusts valve clearance |
| 0631610026 | SET SCREW | Secures pressure regulator position |
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657301130 | HOUS.FRONT SECT | Front section housing the converter |
| 4657301131 | HOUSING REAR PART | Rear section enclosing the output shaft |
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