ZF 4661.305.002 INNER DISK CARRIER for WG90/WG94 | OEM Genuine Part

Overview

The ZF 4661.305.002 INNER DISK CARRIER is a precision-machined component engineered for the clutch pack assembly within WG90 and WG94 series transmissions. This OEM genuine part serves as the rotating hub that houses and aligns the inner friction disks, ensuring proper torque transfer and smooth gear engagement. Located directly within the main gearset, the carrier interfaces with the TRANSMISSION HOUSING and the HOUSING II to maintain concentricity under high-load conditions. The SKU 4661.305.002 is a direct replacement for original equipment, guaranteeing factory tolerances and material integrity.

Symptoms of Failure

• Delayed or harsh shifting – When the inner disk carrier wears, friction disks lose proper alignment, causing erratic clutch engagement and noticeable shift shock.
• Metallic grinding noise during gear changes – Worn splines or carrier bore damage allow the disks to chatter against the CYLINDRICAL PIN and housing walls, producing a distinct grinding sound.
• Transmission fluid contamination with metallic debris – Carrier surface degradation sheds fine metal particles into the oil, visible during routine fluid changes as glitter or sludge.
• Intermittent gear slipping under load – A cracked or distorted carrier cannot maintain clamping force on the disk stack, leading to torque loss during acceleration or hill climbing.

Technical Specifications

Compatibility

This inner disk carrier is designed for ZF WG90 and WG94 series transmissions, which are commonly used in medium-duty trucks, buses, and off-highway equipment. Based on the carrier’s spline geometry and clutch pack dimensions, it also fits the following ZF models: WG180, WG200, WG210, and WG250. Always verify the carrier’s fitment by cross-referencing your transmission’s serial number with the OEM parts catalog. The carrier works in conjunction with the TUBE that routes lubrication oil to the clutch pack.

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