Overview
The ZF 4644.302.189 INPUT SHAFT is a precision-engineered OEM genuine component designed for the WG180, WG200, and WG201 series transmissions. This critical shaft transmits engine torque from the torque converter directly into the planetary gear set, serving as the primary rotational interface within the gearbox. As a high-stress rotating element, the 4644.302.189 input shaft must withstand significant torsional loads while maintaining exact concentricity. This part is frequently replaced alongside the 4644105475: DISCONNECTION unit during major transmission overhauls, as both components share a direct mechanical interface within the clutch pack assembly.
Symptoms of Failure
- Transmission gear slipping under load: When the input shaft splines wear, the torque transfer becomes intermittent, causing the WG180/WG200 to slip out of gear during acceleration.
- Front seal oil leakage: A worn or scored input shaft surface damages the seal lip, resulting in visible ATF drips from the bell housing area.
- Abnormal vibration or driveline shudder: Bent or unbalanced input shafts produce rhythmic shaking that intensifies with engine RPM, often misdiagnosed as a torque converter issue.
- Difficult gear engagement: Damaged splines on the 4644.302.189 shaft prevent smooth meshing with the clutch hub, causing grinding noises when shifting into forward or reverse.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.302.189 |
| Overall Length | 385 mm (estimated) |
| Spline Major Diameter | 32 mm |
| Spline Tooth Count | 24 (input end) |
| Material | Case-hardened alloy steel (20MnCr5) |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4644.302.189 |
| Surface Treatment | Nitrided wear layer |
Compatibility
This genuine ZF input shaft is engineered specifically for the WG180, WG200, and WG201 transmission families. It is a direct replacement for all sub-variants within these series, including WG180-1, WG200-2, and WG201-3 models. The shaft interfaces directly with the 4642303097: OUTPUT FLANGE via the planetary carrier, and is secured using 0636020211: HEXAGON SCREW fasteners. The entire assembly is housed within the 4644101134: TRANSMISSION HOUSING, which provides the structural support for the shaft bearings.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105475 | Disconnection | Clutch pack separation mechanism |
| 4642303097 | Output Flange | Torque transfer to driveshaft |
| 0636020211 | Hexagon Screw | Fastener for shaft retention |
| 4644101134 | Transmission Housing | Main structural casing |
| 4644301349 | Housing | Secondary cover component |
| 0730365125 | Type Plate | Identification label |
| 0631311009 | Grooved Stud | Alignment dowel pin |
| 0636305019 | Screw Plug | Oil passage seal |
| 4644301247 | Threaded Bush | Bearing support insert |
| 0634303485 | O-Ring | Hydraulic seal |
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