Overview
The ZF 4644.306.001 GEAR SHIFT HOUSING is a precision-machined OEM genuine component designed exclusively for the WG 65 Series transmission. This housing encloses and protects the shift mechanism, providing the structural foundation for gear selection within the transmission assembly. It sits directly atop the main transmission casing, interfacing with the shift forks and selector rails to ensure precise engagement of each gear ratio. The SKU 4644.306.001 is manufactured to ZF’s original specifications, guaranteeing exact fitment and long service life. When replacing this unit, it is critical to also inspect the TRANSMISSION HOUSING for cracks or wear, as both components work in tandem to maintain internal alignment.
Symptoms of Failure
- Oil leaks around the shift tower: A worn or cracked gear shift housing often allows transmission fluid to seep past the mating surfaces, leaving visible drips or wet spots on the exterior.
- Gear engagement difficulty or grinding: When the housing becomes distorted or its mounting points loosen, the shift linkage loses alignment, causing hard shifting or audible grinding during gear changes.
- Excessive shift lever play: A failing housing can result in sloppy or imprecise gear selection, where the lever feels loose or moves more than normal before engaging a gear.
- Transmission slipping out of gear: Structural fatigue in the housing may prevent the shift forks from holding the selected gear, leading to unexpected disengagement under load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.306.001 |
| Material | Die-cast aluminum alloy |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Overall Length | 245 mm |
| Overall Width | 180 mm |
| Overall Height | 95 mm |
| OEM Reference | ZF 4644.306.001 |
| Mounting Bolt Torque | 45 Nm |
Compatibility
This gear shift housing is engineered for the ZF WG 65 Series transmission family. While primarily designed for the WG65 model, it is also compatible with the WG180, WG200, and WG210 variants due to shared shift housing architecture. Always verify the transmission serial number before installation. For a complete rebuild, ensure you have the correct HEXAGON SCREW (M8x20), HEXAGON SCREW (M10x25), and HEXAGON SCREW (M12x30) to secure the housing properly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Main casing that encloses gear sets |
| 0636011038 | HEXAGON SCREW | M8 bolt for shift housing attachment |
| 0636011118 | HEXAGON SCREW | M10 bolt for housing-to-casing joint |
| 0636016015 | HEXAGON SCREW | M12 bolt for heavy-duty mounting |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for housing positioning |
| 0634313118 | O-RING | Seals shift housing to transmission case |
| 0636304019 | SCREW PLUG | Closes oil passages in the housing |
| 0634801152 | SEALING RING | Prevents fluid leaks at plug points |
| 0732611049 | FILTER INSERT | Traps debris in the shift housing cavity |
| 0634303718 | O-RING | Secondary seal for shift shaft bore |
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