Overview
The ZF 4616.102.054 INPUT for WG65 is a critical OEM genuine component engineered to transfer rotational force from the torque converter directly into the planetary gear set of the transmission. Positioned at the front of the main shaft assembly, this input shaft absorbs high-torque loads and ensures smooth power delivery during gear shifts. The SKU 4616.102.054 is precision-machined to exact factory tolerances, making it a direct replacement for worn units in the WG 65 Series. When paired with a properly sealed 4616105413: OUTPUT and a stable 4616101127: TRANSMISSION HOUSING, this part restores driveline integrity and prevents premature wear on adjacent components.
Symptoms of Failure
- Delayed or harsh engagement — A worn input shaft causes a noticeable lag when shifting from Neutral to Drive or Reverse, often accompanied by a clunking noise.
- Transmission fluid leaks at the bell housing — Deterioration of the sealing surface on the input shaft leads to oil seepage, visible as drips near the engine-transmission junction.
- Vibration during acceleration — Excessive play in the input splines creates driveline shudder, especially under heavy load or when climbing grades.
- Gear slipping under torque — As the shaft loses its hardened surface, it can no longer maintain positive engagement, causing intermittent power loss in higher gears.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.102.054 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm |
| Spline Diameter | 38 mm (input end) |
| Weight | 4.2 kg |
| OEM Reference | ZF 4616.102.054 |
| Surface Treatment | Nitrided for wear resistance |
Compatibility
This input shaft is specifically designed for the ZF WG 65 Series transmissions, including models such as the WG65, WG80, WG120, WG150, WG180, and WG200. It is also compatible with certain variants of the WG 60 Series that share the same input spline geometry. Always verify the spline count and shaft length against your existing unit before installation. For a complete rebuild, consider replacing the 4616203017: OUTPUT FLANGE and securing the assembly with a new 0636011038: HEXAGON SCREW to ensure proper torque retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers power from planetary gear set to driveline |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to driveshaft yoke |
| 4616101127 | TRANSMISSION HOUSING | Encloses and supports all internal rotating assemblies |
| 0636011038 | HEXAGON SCREW | Secures input shaft bearing retainer |
| 0636016015 | HEXAGON SCREW | Fastens output flange to shaft |
| 0631306085 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634313118 | O-RING | Seals input shaft bore against fluid loss |
| 0732611049 | FILTER INSERT | Traps debris in hydraulic circuit |
| 0634303718 | O-RING | Seals output flange hub |
| 0636610082 | STUD | Positions valve body on housing |
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