Overview
The ZF 4646.309.018 OUTPUT FLANGE is a critical driveline component engineered specifically for the WG 250 Series transmission. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the driveshaft, transferring rotational torque from the gearbox to the vehicle’s axles. Machined from high-strength forged steel, the flange ensures precise alignment and vibration-free power delivery under heavy loads. The SKU 4646.309.018 is the direct replacement for the original factory-installed flange, guaranteeing a perfect fit within the rear housing assembly. It is mounted directly adjacent to the TRANSMISSION HOUSING and is secured by the HEXAGON SCREW fasteners that lock the assembly together.
Symptoms of Failure
When the ZF 4646.309.018 OUTPUT FLANGE begins to wear, operators will notice distinct performance issues. Look for these specific failure symptoms:
- Transmission fluid leaking from the output seal area — A worn flange spline or damaged sealing surface allows oil to escape, often seen as drips near the driveshaft connection.
- Driveline vibration under acceleration — Excessive play between the flange and output shaft creates imbalance, causing a rhythmic shudder at highway speeds.
- Clunking noise when shifting between forward and reverse — Worn splines or a loose flange nut produce a metallic impact sound during gear engagement.
- Premature bearing wear in the rear housing — A failing flange transfers stress to the HOUSING, accelerating internal component degradation.
Technical Specifications
| Part Number | 4646.309.018 |
| OEM Reference | ZF 4646.309.018 |
| Material | Forged alloy steel (heat-treated) |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Outer Diameter | 130 mm |
| Bolt Circle Diameter | 100 mm |
| Spline Count | 14 internal splines |
| Surface Finish | Black oxide coating |
| Torque Spec | 180 Nm (133 ft-lbs) |
Compatibility
This OUTPUT FLANGE is designed for the WG 250 Series transmission family. It is also compatible with the following ZF models that share the same output shaft geometry and spline pattern: WG 180, WG 200, WG 210, and WG 240. Always verify the spline count and bolt pattern against your existing flange before installation. The flange interfaces directly with the COVER that seals the rear of the transmission housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101029 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4646301090 | HOUSING | Rear housing section supporting output shaft |
| 4646301087 | COVER | Seals rear housing and retains bearings |
| 0636015304 | HEXAGON SCREW | Fastens housing to transmission case |
| 0636101828 | CAP SCREW | Secures cover plate to housing |
| 4646301102 | COVER SHEET | Protective shield for internal components |
| 4646301235 | COVER SHEET | Secondary sealing cover |
| 0730365067 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for housing assembly |
| 0636101193 | CAP SCREW | Bolt for flange retention |
