ZF 4168.028.378 CONVERTER Torque Converter Assembly | Complete Unit

Overview

The ZF 4168.028.378 CONVERTER Torque Converter Assembly is a critical hydraulic coupling component that transfers engine torque to the transmission input shaft while multiplying rotational force during launch. Positioned between the flywheel and the gearset within the bell housing, this complete unit replaces worn-out converters to restore smooth power delivery. The SKU 4168.028.378 is engineered for heavy-duty ZF WG-series transmissions, ensuring precise lock-up engagement and minimal heat generation. When installing this assembly, always inspect the 4661101020: TRANSMISSION HOUSING for cracks or warping, as misalignment can accelerate converter wear.

Symptoms of Failure

• Shuddering during lock-up: A persistent vibration when the torque converter clutch engages, often felt at highway speeds, indicates worn friction material inside the 4168.028.378 unit.
• Delayed or harsh shifting: If the converter fails to stall properly, you may experience sluggish acceleration or abrupt gear changes, especially under load.
• Transmission fluid contamination: Dark, burnt-smelling oil with metallic particles points to internal converter wear, often accompanied by leaks from the 4661301046: HOUSING II seal area.
• Overheating warnings: A failing torque converter generates excessive heat, triggering temperature alarms or causing the transmission to enter limp mode.

Technical Specifications

Compatibility

This torque converter assembly is designed for ZF WG 90 Series and WG 94 Series transmissions, commonly found in medium-duty trucks, buses, and off-highway equipment. Specific compatible models include WG180, WG200, WG210, and WG220 variants. The 4168.028.378 unit interfaces directly with the 4661301093: TUBE for oil feed and requires proper alignment with the 0631306174: CYLINDRICAL PIN during installation to prevent vibration. Always verify your transmission serial number against ZF application charts before ordering.

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