ZF 4661.002.015 4 WG 90 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4661.002.015 4 WG 90 Powershift Transmission Assembly | Complete Unit is a fully assembled drop-in replacement for heavy-duty powershift applications. This complete unit integrates the clutch pack, planetary gear sets, and hydraulic control valve body into a single, pre-tested assembly. Designed for the WG 90 series, the SKU 4661.002.015 serves as the central power transfer module, sitting between the torque converter and the output shaft. It is commonly paired with the 4661101021: TRANSMISSION HOUSING to form the main structural shell, while the 4661301047: HOUSING II encloses the rear planetary carrier. For proper lubrication flow, the 4661301093: TUBE must be installed to route oil to the clutch packs.

Symptoms of Failure

• Delayed engagement or gear slipping under load: Worn clutch discs or damaged seals inside the assembly cause the transmission to hesitate before engaging forward or reverse, particularly when hot.
• Erratic shifting and harsh clutch engagement: A failing valve body or scored piston bores lead to abrupt, jarring shifts instead of smooth power transitions.
• External oil leaks near the bell housing: Cracks in the assembly casing or degraded O-rings allow ATF to weep from the joint between the unit and the 0631306174: CYLINDRICAL PIN alignment bore.
• Metallic grinding noise during operation: Worn planetary gears or bearing failure produce a distinct whine or grinding sound, indicating imminent internal damage.

Technical Specifications

Compatibility

This complete unit is engineered for the WG 90 series of ZF powershift transmissions. It is directly compatible with the following models: WG 90, WG 120, WG 150, and WG 180. It also fits select WG 200 variants when used with the correct adapter plate. Always verify the serial number on your existing assembly before ordering.

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