ZF 4166.034.021 CONVERTER Torque Converter Assembly | Complete Unit

Overview

The ZF 4166.034.021 CONVERTER Torque Converter Assembly is a complete, factory-matched unit designed for the WG 250 Series transmission family. This critical component sits between the engine flywheel and the transmission input shaft, functioning as a fluid coupling to multiply engine torque while dampening driveline vibrations. The SKU 4166.034.021 replaces worn or failed converters to restore smooth power delivery and prevent premature wear on adjacent components such as the TRANSMISSION HOUSING and the HOUSING assembly. Each unit is precision-balanced and sealed to OEM specifications for direct bolt-on installation.

Symptoms of Failure

• Shuddering or vibration during acceleration: A failing torque converter often causes a noticeable shudder when the lockup clutch engages, especially at highway speeds.
• Transmission fluid overheating: Worn internal stator bearings or a damaged impeller can generate excessive heat, leading to burnt-smelling fluid and dashboard warning lights.
• Delayed or harsh gear engagement: When the converter fails to maintain proper hydraulic pressure, shifts become erratic or delayed, particularly from a stop.
• Torque converter clutch (TCC) slippage: A worn lockup clutch will cause RPM flare without corresponding vehicle speed increase, often accompanied by a check engine light.

Technical Specifications

Compatibility

This torque converter is engineered for the ZF WG 250 Series, including models WG180, WG200, and WG250. It is also compatible with certain WG 150 variants that share the same bellhousing pattern. Always verify the pilot bore and flexplate bolt pattern against your existing unit. For complete transmission rebuilds, pair this converter with the COVER and secure all fasteners using the HEXAGON SCREW kit to ensure proper clamping force.

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