Overview
The ZF 4642.309.018 OUTPUT FLANGE is a critical driveline component engineered for the WG100 and WG150 series transmissions. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the vehicle’s driveshaft, transferring rotational torque from the gearbox to the differential. Constructed from high-strength forged steel, the flange ensures precise alignment and vibration-free power delivery. The SKU 4642.309.018 is machined to exact ZF tolerances, featuring a splined bore that mates directly with the output shaft and a bolt pattern for secure yoke attachment. This part is housed within the rear section of the transmission assembly, adjacent to the TRANSMISSION HOUSING (4642101109) and the TRANSMISSION HOUSING (4642301205), both of which provide structural support and sealing for the output area.
Symptoms of Failure
- Transmission fluid leak at the rear seal: A worn or cracked output flange allows oil to seep past the seal, leaving puddles under the vehicle and reducing lubrication levels.
- Driveline vibration during acceleration: Spline wear or flange distortion causes imbalance, resulting in noticeable shaking through the chassis at highway speeds.
- Clunking noise when shifting gears: Excessive play between the flange and output shaft creates a metallic knock during gear engagement or load changes.
- Difficulty maintaining gear engagement: A damaged flange can misalign the output shaft, leading to intermittent slipping or harsh shifting in the WG100 and WG150 series.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4642.309.018 |
| Material | Forged Steel (C45 or equivalent) |
| Overall Diameter | 180 mm (7.09 in) |
| Overall Length | 95 mm (3.74 in) |
| Spline Count | 24 internal splines |
| Bolt Hole Pattern | 8 holes, 12 mm diameter, on 150 mm PCD |
| Weight | 3.2 kg (7.05 lbs) |
| OEM Reference | ZF 4642.309.018 |
| Surface Treatment | Zinc-plated with black passivation |
Compatibility
This output flange is specifically designed for the ZF WG100 and WG150 transmission series, which are commonly found in medium-duty trucks, buses, and construction equipment. While the 4642.309.018 is not directly compatible with the larger WG180 or WG200 models due to different spline dimensions and bolt patterns, it shares the same mounting interface as the WG100 and WG150 variants. For proper identification, always verify the TYPE PLATE (0730365125) on your transmission housing, which lists the exact model and serial number. Additionally, the flange is secured using the GROOVED STUD (0631311009) for precise torque retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses and supports the gear train and output shaft assembly |
| 4642301205 | TRANSMISSION HOUSING | Rear housing section that seals the output flange area |
| 0730365125 | TYPE PLATE | Identifies transmission model and serial number for part verification |
| 0631311009 | GROOVED STUD | Secures the output flange to the output shaft with controlled torque |
| 4642301168 | SCREEN SHEET | Filters debris from transmission oil in the sump area |
| 4642301169 | SCREEN SHEET | Secondary oil filter screen for high-flow applications |
| 0636100621 | HEXAGON SCREW | Fastener for mounting housing covers and brackets |
| 4642301186 | SCREEN SHEET | Fine-mesh filter for hydraulic control circuits |
| 4644106300 | SHIFT SYSTEM | Controls gear selection and clutch engagement |
| 4644306500 | COVER PLATE | Seals the transmission housing access opening |
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