ZF 4646.302.079 CONVERTER BELL for WG251 | OEM Genuine Part

Overview

The ZF 4646.302.079 CONVERTER BELL is a critical structural component designed for the WG 251 Series transmission. This OEM genuine part serves as the mounting interface between the torque converter assembly and the main transmission housing, ensuring precise alignment and torque transfer. The SKU 4646.302.079 is machined from high-strength cast iron to withstand the extreme torsional loads and thermal expansion inherent in heavy-duty industrial applications. Positioned directly behind the engine flywheel housing, this bell housing protects the converter from debris while maintaining concentricity for smooth power delivery.

Symptoms of Failure

• Oil seepage at the bell housing seam: When the ZF 4646.302.079 warps or develops micro-cracks, transmission fluid leaks around the mating surface with the TRANSMISSION HOUSING, creating visible drips under the vehicle.
• Torque converter misalignment noise: A rhythmic grinding or whining sound during acceleration indicates the bell housing has lost its dimensional stability, causing the converter to rub against internal components.
• Vibration during gear engagement: Worn mounting bosses or bolt hole elongation in the converter bell leads to excessive play, transmitting harsh vibrations through the driveline when shifting between forward and reverse.
• Difficulty mating transmission to engine: A distorted bell housing prevents proper seating of the CAP SCREW fasteners, resulting in uneven gaps and potential starter ring gear interference.

Technical Specifications

Compatibility

This converter bell is engineered for the ZF WG 251 Series, but it also fits select models in the WG180, WG200, and WG240 families due to shared bell housing patterns. It is directly compatible with the HOUSING assembly and the COVER plate that seals the converter cavity. Always verify the bolt circle diameter and pilot bore depth against your specific transmission serial number before installation.

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