Overview
As a critical drivetrain component within the ZF WG100, WG130, and WG131 series transmissions, the ZF 4681.303.002 OUTPUT SHAFT serves as the final mechanical interface between the gearbox and the vehicle’s drive axle. This OEM genuine part transmits rotational torque from the planetary gear set directly to the output flange, ensuring smooth power delivery under heavy loads. Positioned at the rear of the transmission housing, the shaft supports the output bearing and maintains precise alignment of the gear train. The SKU 4681.303.002 is manufactured to ZF’s original specifications, guaranteeing exact fitment and load-bearing capacity for commercial vehicles, construction equipment, and marine applications.
Symptoms of Failure
When the output shaft begins to degrade, operators often notice distinct operational issues. Recognizing these signs early can prevent catastrophic transmission damage:
- Rear main seal oil leaks: A worn shaft surface or damaged splines can compromise the output seal, leading to visible oil drips from the transmission bell housing.
- Vibration under acceleration: Excessive radial play from a fatigued shaft causes driveline shudder, particularly during gear engagement or when climbing grades.
- Intermittent gear slipping: If the output shaft splines strip or wear unevenly, torque transfer becomes inconsistent, resulting in momentary loss of drive power.
- Metallic grinding noises: Contact between a misaligned shaft and the output bearing race produces a distinct, high-pitched grinding sound at low speeds.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4681.303.002 |
| Overall Length | 385 mm (approx.) |
| Shaft Diameter (bearing journal) | 45 mm |
| Spline Count | 24 involute splines |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.2 kg (9.3 lbs) |
| OEM Reference | ZF 4681.303.002 |
Compatibility
This genuine output shaft is engineered for direct replacement in the following ZF transmission families. Verify your transmission model tag before ordering:
- WG100 Series – All variants including WG100, WG100-5, and WG100-6
- WG130 Series – Standard and heavy-duty configurations
- WG131 Series – Updated generation with reinforced output housing
- BP 210 Series – Select models using the WG100 gearset architecture
- BP 230 Series – Compatible with specific output flange adapters
For cross-reference, this shaft also fits certain ZF 4WG-180 and ZF 4WG-200 variants where the output flange bolt pattern matches. Always consult your parts manual for confirmation.
