Overview
The ZF 4644.104.013 DIFFERENTIAL is a critical torque-distribution component engineered specifically for the WG 180 and WG 200 series transmissions. This OEM genuine part ensures that power from the driveshaft is correctly split between the left and right axles, allowing for smooth cornering and reduced tire wear under heavy load. As a core element of the final drive assembly, the differential works in concert with the 4644101164: TRANSMISSION HOUSING to maintain precise gear alignment. The SKU 4644.104.013 is manufactured to ZF’s original tolerances, guaranteeing a direct replacement without modification.
Symptoms of Failure
When the ZF 4644.104.013 differential begins to wear, operators often notice a distinct “howling” or “whining” noise from the axle area during turns, which is a classic sign of gear tooth degradation. Another common symptom is a chattering or clunking sensation when accelerating from a stop, indicating excessive backlash in the differential gears. You may also experience uneven tire wear patterns across the drive axle, as the differential fails to compensate for speed differences between wheels. Finally, oil seepage around the differential housing can occur, often traced back to a compromised seal that requires immediate attention to prevent internal contamination.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4644.104.013 |
| OEM Reference | ZF 4644.104.013 |
| Material | Case-hardened alloy steel |
| Weight (approx.) | 14.5 kg (32.0 lbs) |
| Outer Diameter | 280 mm |
| Overall Length | 195 mm |
| Gear Ratio | 3.73:1 (estimated for WG200) |
| Compatible Housing | 4644301371: TRANSMISSION HOUSING |
Compatibility
This differential is primarily designed for the ZF WG 200 Series transmissions, with direct application in the WG 180 and WG 200 models. It is also compatible with certain variants of the WG 160 series where the final drive housing dimensions match. For proper identification, always verify the 0730365067: TYPE PLATE on your transmission to confirm the exact series. The part integrates with the 0631311009: GROOVED STUD for secure mounting within the axle housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101164 | TRANSMISSION HOUSING | Encloses the differential and gear train |
| 4644301371 | TRANSMISSION HOUSING | Alternate housing for WG200 series |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Mounting fastener for differential cover |
| 4644303060 | COVER PLATE | Seals the differential access opening |
| 4644201011 | COVER PLATE | Alternative cover for earlier WG models |
| 4644201010 | COVER PLATE | Lightweight cover plate variant |
| 4644301372 | COVER PLATE | Reinforced cover for heavy-duty use |
| 0636610028 | STUD | Threaded stud for housing assembly |
| 0634306525 | O-RING | Seal for differential cover joint |
