Overview
The ZF 4616.102.404 INPUT for WG65 is a critical OEM genuine component engineered to transfer rotational force from the torque converter directly into the planetary gearset of your WG Series transmission. This input shaft assembly sits at the front of the transmission housing, serving as the primary mechanical link between the engine and the internal clutch packs. Designed with precision-ground splines and hardened alloy steel construction, the 4616.102.404 ensures minimal power loss and consistent engagement under high-torque conditions. When replacing this part, it is essential to inspect the adjacent TRANSMISSION HOUSING for cracks or wear, as misalignment can accelerate input shaft failure. The SKU 4616.102.404 is a direct-fit OEM replacement that restores factory-spec performance to your WG65 transmission.
Symptoms of Failure
- Torque converter shudder during acceleration: A worn input shaft spline causes intermittent engagement, leading to vibration between 20-40 mph. This is a common “ZF transmission shudder” search query.
- Transmission fluid leaks near the bell housing: Deterioration of the input shaft seal surface allows ATF to weep past the HEXAGON SCREW mounting points, leaving puddles under the vehicle.
- Delayed or harsh engagement from Park to Drive: Excessive axial play in the 4616.102.404 prevents the clutch packs from fully seating, creating a 2-3 second lag before gear engagement.
- Metallic grinding noise in neutral: Worn needle bearings on the input shaft produce a distinct scraping sound, often misdiagnosed as a failing torque converter.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4616.102.404 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm (12.28 in) |
| Spline Diameter | 32 mm (1.26 in) – 14-tooth involute |
| Weight | 4.2 kg (9.26 lbs) |
| OEM Reference | ZF 4616.102.404 (Genuine) |
| Torque Capacity | 1,200 Nm (885 lb-ft) |
| Seal Surface Hardness | 58-62 HRC |
Compatibility
This input shaft is specifically designed for the ZF WG65 transmission series, which is widely used in medium-duty trucks, buses, and construction equipment. While the 4616.102.404 is optimized for the WG65, it also fits the following ZF models that share the same front input architecture: WG180, WG200, WG210, and WG250. Always verify the spline count and overall length against your existing shaft. During installation, ensure the HOUSING (part 4616301307) and HOUSING (part 4616301309) are free of burrs to prevent premature wear on the new input shaft.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101116 | TRANSMISSION HOUSING | Encloses the gearset and supports the input shaft bearing |
| 0636011118 | HEXAGON SCREW | Secures the input shaft bearing retainer to the housing |
| 4616301307 | HOUSING | Intermediate housing for the clutch pack assembly |
| 4616301309 | HOUSING | Rear housing section supporting the output shaft |
| 0636011038 | HEXAGON SCREW | M10 bolt for housing flange connection |
| 0636016015 | HEXAGON SCREW | M12 bolt for torque converter mounting |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for housing dowel holes |
| 0634313118 | O-RING | Seals the input shaft bore against fluid leaks |
| 0636304019 | SCREW PLUG | Closes the oil passage port in the housing |
| 0634801152 | SEALING RING | Prevents oil bypass at the input shaft journal |
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