Overview
The ZF 4657.104.406 DIFFERENTIAL is a critical torque-distribution component engineered specifically for the WG 190 and WG 210 series transmissions. This OEM genuine part sits at the heart of the final drive assembly, managing the rotational speed difference between the left and right output shafts while delivering maximum traction under heavy load. As a precision-machined unit, the SKU 4657.104.406 ensures smooth power transfer from the transmission housing to the axles, directly influencing vehicle stability and driveline efficiency. When paired with the 4657101039: TRANSMISSION HOUSING, this differential forms the core of the load-sharing system in WG 210 applications.
Symptoms of Failure
- Persistent oil leaks around the differential housing: Worn seals or bearing surfaces cause transmission fluid to escape, often visible as drips near the axle interface. This is a common “ZF differential oil leak” search query.
- Gear slipping under acceleration: A failing differential may produce a momentary loss of drive power when climbing grades or pulling heavy loads, often described as “WG 210 transmission slipping” in service logs.
- Whining or grinding noise during turns: Damaged spider gears or worn side bearings generate a distinct metallic whine that intensifies during cornering, a classic “differential noise in ZF transmission” symptom.
- Vibration in the driveline: Uneven torque distribution from a worn differential creates low-frequency vibrations felt through the chassis, particularly at speeds above 40 km/h.
Technical Specifications
| Part Number | 4657.104.406 |
| OEM Reference | ZF 4657.104.406 (Genuine) |
| Material | Case-hardened alloy steel with induction-hardened bearing surfaces |
| Weight | 18.4 kg (40.6 lbs) |
| Overall Diameter | 285 mm |
| Bearing Journal Diameter | 65 mm |
| Gear Ratio | 3.73:1 (standard WG 210 configuration) |
| Fastener Torque Spec | 180 N·m (using 0636100801: CAP SCREW) |
| Sealing System | Lip seal with integrated dust shield |
Compatibility
This differential is designed for the ZF WG 190 and WG 210 series transmissions, which are commonly found in medium-duty trucks, construction loaders, and agricultural tractors. It also fits the WG 180 and WG 200 variants when used with the appropriate 4657201028: HOUS.FRONT SECT and 4657201013: HOUSING REAR PART. The part is not compatible with the WG 120 or WG 150 series without significant housing modifications. For proper installation, always use the 0631306792: CYLINDRICAL PIN to align the differential within the carrier.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Encloses the differential and gear train |
| 4657201028 | HOUS.FRONT SECT | Front section of the differential carrier |
| 4657201013 | HOUSING REAR PART | Rear section of the differential carrier |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for differential assembly |
| 0636100801 | CAP SCREW | Fastener for differential cover |
| 4656301148 | FIXING PLATE | Secures differential bearings in housing |
| 4657301034 | SCREEN SHEET | Filter screen for differential lubrication |
| 4657301035 | SCREEN SHEET | Secondary filter screen for oil return |
| 0636100803 | CAP SCREW | Fastener for bearing cap |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing for differential lubrication |
