Overview
The ZF 4644.301.223 TRANSMISSION HOUSING is the central structural core of the WG200 series automatic transmission. This OEM genuine part, identified by SKU 4644.301.223, encases the planetary gear sets, valve body, and torque converter assembly, providing precise alignment and robust protection against operational stresses. As a critical load-bearing component, it ensures that all internal rotating elements maintain correct tolerances under high torque conditions. When replacing this housing, it is common to also inspect the 4644101216: TRANSMISSION HOUSING for compatibility in earlier WG180 builds, as both share similar mounting interfaces.
Symptoms of Failure
- Persistent oil leaks at the bell housing seam: Cracks or porosity in the 4644.301.223 housing allow transmission fluid to escape, often pooling under the vehicle after extended operation.
- Gear slipping or delayed engagement: Warpage of the housing face distorts valve body alignment, causing erratic hydraulic pressure and slipping between ratios.
- Unusual metallic grinding noises: Internal bearing bore wear within the housing permits shaft misalignment, leading to gear tooth contact wear and audible grinding during acceleration.
- Contaminated fluid from cracked casting: A fractured housing can allow debris or moisture ingress, resulting in dark, burnt-smelling transmission fluid and reduced shift quality.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.301.223 |
| Material | High-strength aluminum alloy (A356-T6) |
| Weight | 14.2 kg (31.3 lbs) |
| Overall Length | 485 mm |
| Overall Width | 320 mm |
| Overall Height | 275 mm |
| Bolt Hole Pattern | 12-point, M10 x 1.5 |
| OEM Reference | ZF 4644.301.223 |
| Surface Treatment | Clear anodized |
Compatibility
This housing is engineered specifically for the ZF WG200 series transmissions, including the WG200, WG210, and WG220 variants. It is also backward-compatible with select WG180 models when used with the appropriate 4644303060: COVER PLATE adapter kit. For proper identification, always verify the 0730365067: TYPE PLATE on your existing unit to confirm series designation. During installation, the 0631311009: GROOVED STUD must be torqued to factory specifications to prevent housing distortion.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Alternate housing for WG180 series |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for housing mounting |
| 4644303060 | COVER PLATE | Seals the rear housing opening |
| 4644303061 | COVER PLATE | Alternate cover plate variant |
| 0634306525 | O-RING | Hydraulic seal between housing sections |
| 0636305026 | SCREW PLUG | Drain/fill port plug |
| 4644301279 | SCREEN SHEET | Filter mesh for oil pickup |
| 4644301088 | SEALING CAP | Protects unused sensor ports |
| 4644106300 | SHIFT SYSTEM | Hydraulic shift actuator assembly |
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