ZF 4660.306.056 PLUG for WG200/WG92/WG98 | OEM Genuine Part

Overview

The ZF 4660.306.056 PLUG is a critical sealing component engineered for the WG200, WG92, and WG98 series transmissions. This OEM genuine part serves as a threaded closure within the transmission housing, preventing fluid contamination and maintaining hydraulic pressure integrity. The SKU 4660.306.056 is specifically designed to fit into the TRANSMISSION HOUSING assembly, where it seals access ports used during maintenance or sensor installation. When paired with the HOUSING unit, this plug ensures that transmission oil remains contained under high-pressure conditions, directly supporting the reliability of the PERIPHERALS system and the RANGE SELECTOR mechanism.

Symptoms of Failure

• External oil seepage around the plug threads: A worn or cross-threaded 4660.306.056 plug allows transmission fluid to escape, leaving visible drips under the vehicle near the bell housing area.
• Erratic gear engagement during shifting: When this plug fails to seal properly, hydraulic pressure drops, causing delayed or harsh shifts in WG200 and WG98 transmissions.
• Contaminated transmission fluid: A compromised plug permits dirt and moisture ingress, leading to sludge buildup and reduced lubricity in the TRANSMISSION HOUSING.
• Whining noise from the pump circuit: Air ingestion through a faulty plug creates cavitation, producing a high-pitched whine during acceleration in WG92 series units.

Technical Specifications

Compatibility

This genuine ZF plug is designed for the following transmission models: WG180, WG200, WG92, and WG98 series. It is also compatible with select ZF Ecomat 4HP and 5HP variants that share the same housing port configuration. The 4660.306.056 replaces earlier plug designs and is backward-compatible with all WG200 sub-variants manufactured after 2005. Always verify thread pitch and depth against your specific HOUSING before installation.

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