Overview
The ZF 4616.102.403 INPUT for WG65 is a critical OEM genuine component designed to transfer rotational force from the torque converter directly into the planetary gearset of the ZF WG65 transmission. Positioned at the front of the main shaft assembly, this input shaft (SKU: 4616.102.403) ensures precise torque delivery and alignment during high-load operations. As a direct replacement part, it restores factory-spec engagement and eliminates drivetrain slack in heavy-duty industrial applications.
Symptoms of Failure
- Delayed or harsh engagement: A worn input shaft causes noticeable lag or clunking when shifting from neutral to drive, often searched as “ZF transmission engagement delay.”
- Vibration under load: Excessive play in the input splines leads to driveline shudder during acceleration, commonly reported as “WG65 transmission vibration.”
- Transmission fluid contamination: Metal debris from a failing input shaft can mix with the oil, resulting in “metal shavings in ZF transmission fluid.”
- Intermittent gear slipping: As the input loses its seating, torque transfer becomes inconsistent, causing “WG65 gear slip under load.”
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4616.102.403 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.85 kg (10.7 lbs) |
| Overall Length | 312 mm |
| Spline Count | 14-tooth involute spline |
| OEM Reference | ZF 4616.102.403 |
| Surface Treatment | Phosphate coating for corrosion resistance |
Compatibility
This 4616.102.403 input shaft is engineered exclusively for the ZF WG65 series transmission. It is not interchangeable with WG180 or WG200 models due to differences in shaft diameter and spline pitch. Always verify your transmission model tag before installation. For related assemblies, the 4616105402: OUTPUT and 4005303005: OUTPUT FLANGE are commonly replaced in the same service interval. The 4616101119: TRANSMISSION HOUSING provides the structural enclosure, while the 0636011038: HEXAGON SCREW secures the input bearing retainer.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105402 | OUTPUT | Transfers torque from planetary gearset to driveshaft |
| 4005303005 | OUTPUT FLANGE | Connects output shaft to driveline yoke |
| 4616101119 | TRANSMISSION HOUSING | Encases gearset and supports all shaft bearings |
| 0636011038 | HEXAGON SCREW | Fastens input bearing cover to housing |
| 0636011118 | HEXAGON SCREW | Secures output flange to output shaft |
| 0636016015 | HEXAGON SCREW | Mounts housing to engine bellhousing |
| 0631306085 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634313118 | O-RING | Seals input shaft bore against fluid leakage |
| 0636304019 | SCREW PLUG | Closes pressure test ports on housing |
| 0634801152 | SEALING RING | Prevents oil seepage at shaft exit points |
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