Overview
The ZF 4644.353.008 OUTPUT FLANGE is a critical driveline component engineered specifically for the WG 201 series powershift transmission. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the vehicle’s driveshaft, transferring rotational torque from the planetary gearset to the propeller shaft. Machined from high-strength alloy steel, the flange features a precisely splined bore that mates directly to the output shaft, while its bolt pattern secures the companion flange or yoke. The SKU 4644.353.008 is manufactured to ZF’s original tolerances, ensuring concentricity and minimal runout under heavy load. This part sits at the rear of the transmission housing, adjacent to the TRANSMISSION HOUSING (4644101203) and the TRANSMISSION HOUSING (4644301382), which together enclose the rotating assembly.
Symptoms of Failure
- Transmission oil leak at the rear output seal: A worn or cracked output flange damages the sealing surface, allowing ATF to weep past the SEALING RING (0634801098). This is often noticed as drips under the vehicle after parking.
- Driveline vibration during acceleration: Spline wear or flange distortion causes imbalance, producing a low-frequency shudder that intensifies with speed. This symptom is frequently misdiagnosed as a bad U-joint.
- Gear engagement hesitation or clunking: Excessive backlash between the output flange splines and the shaft leads to a delayed or harsh engagement when shifting between forward and reverse.
- Visible corrosion or pitting on the flange face: Exposure to moisture and road salt degrades the flange surface, compromising the seal integrity and leading to progressive oil loss.
Technical Specifications
| Parameter | Value |
|---|---|
| ZF Part Number | 4644.353.008 |
| OEM Reference | 4644 353 008 |
| Material | Alloy steel (42CrMo4 equivalent) |
| Outer Diameter | 130 mm (approx.) |
| Overall Length | 85 mm (approx.) |
| Spline Count | 24 (internal) |
| Bolt Hole Pattern | 6 x M12 on 100 mm PCD |
| Weight | 2.4 kg (approx.) |
| Surface Treatment | Zinc-phosphate + oiled |
| Sealing Surface | Ground finish (Ra ≤ 0.8 µm) |
Compatibility
This output flange is designed for the ZF WG 201 series transmission, but its spline geometry and bolt pattern also make it suitable for several related models. Verified compatibility includes the WG180, WG200, and WG210 transmissions used in off-highway trucks, wheel loaders, and industrial tractors. The flange interfaces directly with the THREADED BUSH (4644301189) and the SCREW PLUG (0636302005) that secure the output shaft assembly. Always confirm the spline count and pilot diameter against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301382 | TRANSMISSION HOUSING | Rear section housing output shaft |
| 4644301189 | THREADED BUSH | Locates and retains output shaft bearing |
| 0636302005 | SCREW PLUG | Seals hydraulic port in housing |
| 0634306198 | O-RING | Seals flange-to-housing joint |
| 0634801098 | SEALING RING | Prevents oil bypass at output shaft |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for housing assembly |
| 4644301161 | COVER PLATE | Access cover for clutch pack |
| 0636100621 | HEXAGON SCREW | Fastener for flange-to-housing |
