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The Genuine Subaru OEM Transmission Bell Housing (Part #30400AA040) is a factory-original component engineered specifically for the 2006–2007 Subaru STI. As a direct-replacement OEM part, it delivers the precise fit, material quality, and dimensional accuracy required to maintain the integrity of your STI's high-performance drivetrain. Whether you're rebuilding a damaged transmission or completing a performance-oriented drivetrain swap, this is the correct factory housing — no modifications needed.
| OEM Part Number | 30400AA040 |
|---|---|
| Brand | Genuine Subaru OEM |
| Component | Transmission Bell Housing |
| Transmission Type | Manual (STI Close-Ratio 6-Speed) |
| Compatible Engine | EJ257 Turbocharged Boxer-4 |
| Application Years | 2006–2007 |
| Condition | New, Genuine OEM |
This genuine Subaru OEM bell housing is designed for the following vehicles:
2006-2007 Subaru STI
Always verify your vehicle's VIN and transmission assembly number against Subaru's factory parts diagram to confirm compatibility before ordering. OEM part number 30400AA040 can be cross-referenced with your vehicle's original parts manual.
Installation of the transmission bell housing requires removal of the transmission assembly from the vehicle. This is a precision drivetrain component — professional installation by a qualified Subaru technician or experienced performance shop is strongly recommended. Torque all fasteners to Subaru factory specifications. Refer to the Subaru STI factory service manual (FSM) for complete disassembly and reassembly procedures.
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