Overview
The ZF 4616.108.403 COUNTERSHAFT is a critical torque-transferring component engineered specifically for the WG 65 Series transmission family. This OEM genuine part serves as the central shaft that synchronizes gear rotation and distributes engine power across the main drive gears within the transmission assembly. Positioned between the input shaft and the 4616105413: OUTPUT, the countershaft ensures smooth power flow and precise gear engagement under heavy-duty operating conditions. The SKU 4616.108.403 is manufactured to ZF’s exacting tolerances, guaranteeing direct interchangeability and long service life in commercial vehicle drivelines.
Symptoms of Failure
When the ZF 4616.108.403 COUNTERSHAFT begins to wear, operators often notice gear grinding or hard shifting during acceleration, particularly in lower gears. A second common symptom is unusual whining or rumbling noise emanating from the transmission housing, which intensifies with road speed. Third, vibration through the gearshift lever or chassis indicates bearing surface degradation on the countershaft. Finally, intermittent loss of power to the wheels may occur as the shaft loses proper alignment with the 4616203017: OUTPUT FLANGE, leading to inefficient torque transfer and potential driveline damage.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4616.108.403 |
| OEM Reference | ZF 4616.108.403 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 485 mm (estimated) |
| Diameter (bearing journals) | 45 mm / 55 mm (estimated) |
| Weight | 8.2 kg (estimated) |
| Spline Count | 22-tooth involute spline |
| Surface Treatment | Black oxide corrosion protection |
| Hardness | 58-62 HRC (case depth 0.8-1.2 mm) |
Compatibility
This countershaft is designed for the ZF WG 65 Series, but it also shares dimensional compatibility with several other ZF heavy-duty transmissions. Confirmed models include the WG65, WG80, WG120, WG180, and WG200 series. It integrates directly with the 4616101117: TRANSMISSION HOUSING and is secured using 0636011038: HEXAGON SCREW fasteners. Always verify the specific transmission serial number before ordering, as minor variations exist between early and late production units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from countershaft to driveline |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to driveshaft yoke |
| 4616101117 | TRANSMISSION HOUSING | Encloses and supports all internal gear train components |
| 0636011038 | HEXAGON SCREW | Secures countershaft bearing caps to housing |
| 0636016015 | HEXAGON SCREW | Fastens output flange to output shaft |
| 0631306085 | CYLINDRICAL PIN | Aligns countershaft with housing bore |
| 0634313118 | O-RING | Seals countershaft bore against oil leakage |
| 0732611049 | FILTER INSERT | Traps debris in transmission lubrication circuit |
| 0634303718 | O-RING | Seals output flange to housing interface |
| 0636610082 | STUD | Provides threaded mounting point for housing covers |
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