Overview
The ZF 4475.305.289 Input Flange is a critical driveline component engineered specifically for the WG 92 series transmission family. This OEM genuine part serves as the primary coupling interface between the transmission output shaft and the driveshaft, transferring rotational torque from the gearbox to the vehicle’s drivetrain. Machined from high-strength forged steel, the flange features precision splines that engage directly with the transmission’s main shaft, ensuring zero-backlash power delivery. The SKU 4475.305.289 is designed to withstand high cyclic loads and thermal expansion, making it essential for heavy-duty commercial applications. When installed, it works in concert with the 4660101015: TRANSMISSION HOUSING and the 4660301054: HOUSING II to maintain proper alignment and sealing within the assembly.
Symptoms of Failure
- Transmission fluid leakage at the flange seal – Worn splines or a cracked flange face can cause oil to weep past the seal, leading to low fluid levels and eventual gearbox overheating.
- Driveline vibration during acceleration – A deformed or worn input flange creates imbalance in the rotating assembly, producing noticeable shuddering at highway speeds.
- Intermittent gear slipping under load – When the flange’s internal splines strip, torque transfer becomes inconsistent, causing the transmission to momentarily lose engagement.
- Clunking noise when shifting between forward and reverse – Excessive backlash from a fatigued flange results in audible metallic impacts during direction changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4475.305.289 |
| OEM Reference | ZF 4475.305.289 |
| Material | Forged alloy steel (induction hardened) |
| Overall Diameter | 180 mm (7.09 in) |
| Overall Length | 95 mm (3.74 in) |
| Spline Count | 24 internal splines |
| Bolt Circle Diameter | 160 mm (6.30 in) |
| Weight | 2.8 kg (6.17 lbs) |
| Surface Finish | Black oxide coated |
Compatibility
This input flange is designed for the ZF WG 92 series, but its spline geometry and bolt pattern also make it suitable for select models in the WG180 and WG200 families. It is commonly found in medium-duty trucks, buses, and off-highway equipment that utilize ZF’s 6-speed and 8-speed automated manual transmissions. For proper fitment, always verify the transmission serial number and compare the flange’s pilot diameter. The flange mounts directly to the 0631306174: CYLINDRICAL PIN for alignment and is secured with the 0769123894: TYPE PLATE for identification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101015 | TRANSMISSION HOUSING | Encloses and supports gear train components |
| 4660301054 | HOUSING II | Secondary housing for clutch and valve body |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for flange-to-shaft positioning |
| 0769123894 | TYPE PLATE | Identification tag with transmission specs |
| 0750100022 | SCREW PLUG | Seals oil passages in the housing |
| 4660221029 | SUCTION TUBE | Oil pickup for lubrication pump |
| 0634100317 | O-RING | Seals flange-to-housing interface |
| 0636103273 | CAP SCREW | Fastens flange to shaft |
| 0634306311 | O-RING | Secondary seal for oil retention |
| 4660321029 | FIXING PLATE | Retains flange axial position |
