Overview
The ZF 4616.303.039 DRIVER is a critical rotating component within the WG65 series transmission assembly. This OEM genuine part serves as the primary input driver, transferring torque from the engine to the planetary gear sets. Positioned directly behind the torque converter, the 4616.303.039 DRIVER ensures precise engagement and smooth power delivery under heavy load conditions. As an original ZF component, it guarantees exact fitment and metallurgical integrity for commercial vehicle applications. The SKU 4616.303.039 is specifically machined to interface with the 4616101059: TRANSMISSION HOUSING, forming the core structural foundation of the gearbox.
Symptoms of Failure
- Delayed engagement or gear slipping under load: When the 4616.303.039 DRIVER wears, the splines or drive lugs lose their interference fit, causing hesitation when shifting from neutral to drive or reverse. This is a common long-tail search query for “ZF WG65 transmission slipping when accelerating.”
- Metallic grinding noise during gear changes: A worn driver produces a distinct grinding or clattering sound, particularly during low-speed maneuvers. This symptom often leads technicians to search for “ZF transmission grinding noise WG65.”
- Transmission fluid contamination with metallic debris: As the driver surface degrades, fine metal particles enter the hydraulic circuit. This can be detected during oil changes and is frequently queried as “metal shavings in ZF transmission fluid.”
- Vibration through the driveline at highway speeds: Uneven wear on the driver causes rotational imbalance, transmitting vibration into the chassis. This symptom is often searched as “ZF WG65 vibration at 60 mph.”
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4616.303.039 |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Weight | 1.85 kg (4.08 lbs) |
| Outer Diameter | 98.5 mm |
| Overall Length | 112.3 mm |
| Spline Count | 24 internal splines |
| OEM Reference | ZF 4616.303.039 |
| Hardness | 58-62 HRC (Rockwell C) |
Compatibility
This 4616.303.039 DRIVER is designed for the ZF WG65 series transmissions, specifically the WG65, WG80, WG100, WG120, WG150, WG180, and WG200 models. It is also compatible with the WG 65 Series variants used in municipal trucks, refuse vehicles, and construction equipment. The driver interfaces directly with the 0636011038: HEXAGON SCREW and 0636011118: HEXAGON SCREW for secure mounting to the clutch pack assembly. Additionally, the 0636016015: HEXAGON SCREW is used to fasten the driver to the input shaft hub. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Encloses and supports all internal gear train components |
| 0636011038 | HEXAGON SCREW | Secures clutch pack assembly to the driver |
| 0636011118 | HEXAGON SCREW | Fastens intermediate plate to the transmission housing |
| 0636016015 | HEXAGON SCREW | Mounts driver to input shaft hub |
| 0631306085 | CYLINDRICAL PIN | Aligns driver with clutch drum during assembly |
| 0634313118 | O-RING | Seals hydraulic pressure between driver and housing |
| 0636304019 | SCREW PLUG | Closes oil passage ports in the housing |
| 0634801152 | SEALING RING | Prevents external oil leaks at the driver shaft |
| 0732611049 | FILTER INSERT | Traps debris from worn driver particles in oil circuit |
| 0634303718 | O-RING | Seals the filter housing to the transmission casing |
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