Overview
The ZF 4616.302.113 INPUT SHAFT is a precision-engineered OEM genuine component designed for the WG 65 Series transmission family. This critical shaft transfers rotational power from the torque converter directly into the planetary gear sets, serving as the primary torque input interface within the transmission assembly. Manufactured to exacting ZF tolerances, the 4616.302.113 ensures minimal backlash and optimal load distribution during high-torque operations. When replacing this shaft, it is essential to inspect the mating 4616105413: OUTPUT and the 4616203017: OUTPUT FLANGE for wear patterns, as these components share the same rotational axis and load path. The shaft sits within the 4616101117: TRANSMISSION HOUSING, secured by precision 0636011038: HEXAGON SCREW fasteners.
Symptoms of Failure
- Torque converter shudder under load: A worn input shaft spline or bearing journal causes irregular power transfer, resulting in vibration during acceleration.
- Transmission fluid leakage at bell housing: Deteriorated shaft seals or surface scoring on the 4616.302.113 allows ATF to escape, often visible as drips near the engine-transmission junction.
- Delayed or harsh engagement: When the input shaft loses its hardened surface integrity, gear engagement becomes erratic, particularly when shifting from Park to Drive or Reverse.
- Metallic debris in transmission pan: Flaking or spalling on the shaft’s contact surfaces generates fine metal particles, detectable during routine fluid changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.302.113 |
| Overall Length | 285 mm (estimated) |
| Spline Diameter | 32 mm (input end) |
| Bearing Journal Diameter | 45 mm |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4616.302.113 |
| Hardness | 58-62 HRC (surface) |
Compatibility
This input shaft is specifically engineered for the ZF WG 65 Series, including models WG65, WG80, and WG100. It also serves as a direct replacement in certain WG120 and WG150 variants that share the same input spline geometry and bearing spacing. Always verify your transmission’s serial number against ZF’s parts catalog before ordering. For complete assembly, pair this shaft with the 4616105413: OUTPUT and the 4616203017: OUTPUT FLANGE to ensure matched rotational balance.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from planetary gears to output flange |
| 4616203017 | OUTPUT FLANGE | Connects transmission to driveshaft |
| 4616101117 | TRANSMISSION HOUSING | Encloses and supports all rotating components |
| 0636011038 | HEXAGON SCREW | Secures input shaft bearing retainer |
| 0636016015 | HEXAGON SCREW | Fastens output flange to output shaft |
| 0631306085 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634313118 | O-RING | Seals input shaft bore in housing |
| 0732611049 | FILTER INSERT | Traps debris from hydraulic circuit |
| 0634303718 | O-RING | Seals output flange to housing |
| 0636610082 | STUD | Positions valve body within transmission |
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