Transmission Type 8-Speed Automatic (Torque Converter)
Condition Fully Refurbished
Manufacturer Aisin Warner (Made in Japan)
Code GA8Y45EW / GA8Y45W / AWF8G45
Supplied With Torque Converter — TCU Not Included
Warranty 3 Months (installation & functionality)
Fully Refurbished Aisin 8-Speed Transmission This GA8Y45EW / AWF8G45 automatic transmission is a completely refurbished unit manufactured by Aisin Warner, designed for BMW and MINI models with a transverse-mounted engine. It is supplied complete with the torque converter, ready for installation as a direct replacement for a worn or faulty gearbox.
Codes & Designations
Transmission Code:
GA8Y45EW • GA8Y45W
Aisin Designation:
AWF8G45 • AW F8G45 • 8G45
Related TCU Reference (not included):
TG81 Controller
No TCU Included This transmission is supplied without a transmission control unit (TCU). We recommend reusing the original TCU from your old transmission, as it is already matched and coded to your vehicle. If you need a TCU, let us know and we can supply one on request.
Technical Specifications
Transmission Type:
8-Speed Automatic, Torque Converter
Aisin Designation:
AWF8G45 (AW F8G45)
Manufacturer:
Aisin, Made in Japan
Condition:
Fully refurbished
Supplied As:
Complete transmission with torque converter, without TCU
Engine Layout:
Transverse-mounted (FWD / xDrive UKL platform)
Installation Note:
Use the original TCU from your old transmission; adaptation may be required
Warranty Period:
3 Months (covers installation and functionality)
Product Description
This is a fully refurbished GA8Y45EW / AWF8G45 8-speed automatic transmission, manufactured by Aisin in Japan, for BMW and MINI models with a transverse-mounted engine. The unit is supplied complete with the torque converter and is intended as a direct replacement for a worn, slipping or faulty transmission.
What This Transmission Does
- Transfers engine power through 8 gear ratios for smooth, efficient acceleration
- Uses the torque converter and lock-up clutch to manage power delivery
- Relies on the TCU and valve body to control shift timing and clutch engagement
- Serves as a direct, like-for-like replacement for a worn or failing original transmission
Torque Converter Included — Option to Remove This transmission is supplied complete with the torque converter. If you do not need the torque converter (for example, if yours is still good), contact us and we can deduct €300
from the price.
Vehicle Compatibility
This transmission fits BMW and MINI models with a transverse-mounted engine paired with the Aisin 8-speed automatic. Always confirm your transmission code before ordering.
BMW
- BMW 1 Series (F40)
- BMW 2 Series Active Tourer / Gran Tourer (F45 / F46)
- BMW 2 Series Gran Coupé (F44)
- BMW X1 (F48)
- BMW X2 (F39)
MINI
- MINI Clubman (F54)
- MINI Countryman (F60)
- MINI Cooper / Cooper S / JCW (F55 / F56 / F57)
Compatibility Check Recommended Fitment depends on engine variant, drivetrain (FWD / xDrive / ALL4) and production period. If you are unsure, send us the code from your old transmission before ordering.
Common Symptoms of a Worn Transmission
Wear in the clutch packs, torque converter or valve body of this 8-speed automatic can produce the symptoms below. Replacing a worn transmission with a refurbished unit restores smooth, reliable shifting.
- Harsh, delayed or jerky gear changes
- Shuddering or vibration under light-to-moderate acceleration (torque converter slip)
- RPM flare or surge between gears
- Delayed engagement from Park/Neutral into Drive, especially when cold
- Transmission warning light on the dashboard
- Gearbox entering emergency / limp mode
- Unusual whining or clunking noises from the transmission
Diagnostic Note These symptoms can also be caused by fluid condition, TCU software or wiring issues rather than the transmission itself. Proper diagnosis before replacement is recommended.
Installation & Service Notes
Recommended Steps
- Confirm the transmission code on your vehicle matches GA8Y45EW / GA8Y45W / AWF8G45
- Reuse the original TCU from your old transmission (recommended) or request one from us
- Decide whether you need the included torque converter, or let us know to deduct it from the price
- Install the transmission carefully using professional workshop procedures
- Fill with the correct ATF fluid type and quantity for this transmission
- Carry out any required adaptation with a suitable diagnostic tool
- Test drive and verify smooth shifting across all gears after installation
Important Installation Note This transmission is supplied without a TCU. Installation by an experienced workshop, using your original control unit, is strongly recommended for correct operation.
Why Choose a Refurbished Transmission
1. Restores Full Transmission Function
A properly rebuilt transmission resolves slipping, shuddering and harsh shifting caused by worn internal components.
2. Key Wear Parts Rebuilt
Clutch packs, friction plates, piston set, oil pump and valve body are inspected and rebuilt during refurbishment for reliable long-term operation.
3. Complete With Torque Converter
Supplied with the torque converter as standard, saving you from sourcing or testing a separate unit.
4. Cost-Effective Alternative
A refurbished transmission offers a more affordable repair route than a brand-new unit, while addressing the main wear points that cause failure.
Quality Assurance & Warranty
3-Month Warranty: This refurbished Aisin 8-speed transmission is supplied with a 3-month warranty covering correct installation and functionality testing under normal operating conditions.
Warranty Coverage Includes:
- Functional defects of the refurbished transmission itself
- Faults present at the time of delivery that are not caused by installation
- Correct operation of the rebuilt internal components under normal use
Warranty Exclusions:
- Incorrect installation or use of an incompatible TCU
- Faults caused by the original TCU, wiring or external components
- Incorrect fluid type, level or missed service intervals
- Physical damage or misuse
Questions or Need Help?
We can help verify compatibility and advise on the TCU and torque converter options for this GA8Y45EW / AWF8G45 transmission.
Contact
Important Purchase Information
- Please compare the code on your original transmission before purchase
- This transmission does not include a TCU — we recommend reusing your original one
- Supplied complete with the torque converter; contact us to deduct €300 if not needed
- Professional installation is recommended
- Photos are for illustrative purposes only
- Worldwide shipping is available
- If your country is not listed at checkout, contact us for manual order processing
- Please check carefully whether this product matches your vehicle before ordering — contact us with any questions
