Overview
The ZF 4616.101.403 TRANSMISSION HOUSING is the central structural core of the WG65 series gearbox. This OEM genuine part encloses the planetary gear sets, valve bodies, and rotating shafts, providing precise alignment and hydraulic fluid containment under high torque loads. As the primary load-bearing component, the housing ensures that all internal assemblies remain in exacting tolerance during heavy-duty operations. The SKU 4616.101.403 is engineered to ZF’s original specifications, guaranteeing a direct fit and long service life in your WG65 transmission.
Symptoms of Failure
- Hydraulic fluid seepage around the bell housing interface: When the housing develops micro-fractures or gasket surface wear, you may notice oil dripping from the transmission-to-engine junction, especially after extended operation under load.
- Persistent gear engagement noise and vibration: A warped or cracked housing can misalign the countershafts and clutches, producing a distinct rumbling or whining sound during gear changes that worsens with temperature.
- Erratic shift timing or delayed engagement: Internal cracks in the housing can disrupt oil galleries, causing pressure drops that lead to slipping between gears or a noticeable lag when shifting from neutral to drive.
- Visible cracks or porosity near mounting bosses: Inspect the housing flanges for hairline fractures, particularly around bolt holes, which allow debris ingress and accelerate internal wear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.101.403 |
| Material | High-strength aluminum alloy (A356-T6) |
| Weight | 18.5 kg (40.8 lbs) |
| Overall Length | 620 mm |
| Overall Width | 380 mm |
| Overall Height | 410 mm |
| OEM Reference | ZF WG65 Series |
| Bolt Torque Spec | 85 Nm (62.7 lb-ft) |
Compatibility
This transmission housing is specifically designed for the ZF WG65 series. It is also compatible with the following ZF transmission models that share the same mounting pattern and oil gallery layout: WG180, WG200, WG210, and WG250. Always verify the casting number on your original housing before ordering, as minor revisions exist across production years.
During installation, you will need to replace several companion components to ensure a leak-free assembly. The 4616105418: VALVE controls hydraulic flow within the housing, while the 0501319251: SOLENOID VALVE manages clutch pressure modulation. Use a new 0636302013: SCREW PLUG to seal the drain port, and always install a fresh 0634801038: SEALING RING on the input shaft bore to prevent oil bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105418 | VALVE | Regulates oil flow to clutch packs |
| 0501319251 | SOLENOID VALVE | Electro-hydraulic shift control |
| 0636302013 | SCREW PLUG | Seals housing drain or test ports |
| 0634801038 | SEALING RING | Prevents oil leaks at shaft passages |
| 4616305078 | CONSOLE | Mounting bracket for transmission support |
| 0636010047 | HEXAGON SCREW | Fastens housing to engine bellhousing |
| 0636101020 | CAP SCREW | Secures valve body within housing |
| 0630001010 | WASHER | Distributes load under bolt heads |
| 0637006015 | HEXAGON NUT | Locks mounting studs in place |
| 0501223098 | HOSE PIPE | Transfers oil between housing and cooler |
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