HKS Toyota GR Corolla Transfer Case Oil Cooler Kit | 27002-AT001
The HKS Transfer Oil Cooler Kit is designed to enhance the performance and durability of the Toyota GR Corolla (GZEA14H, 2023–2025) by controlling transfer oil temperature during high-load driving. This complete system adds an external oil cooler, high-efficiency electric oil pump, and an intelligent controller to ensure consistent lubrication and protection of the 4WD transfer unit.
Key Features
- Optimized Cooling Efficiency: Reduces transfer oil temperatures by up to 20°C under continuous high-load driving.
- Enhanced Durability: Prevents overheating and oil degradation, ensuring stable AWD system performance in track or rally conditions.
- Intelligent Control System: Automatically manages pump activation with overcurrent and abnormal temperature protection.
- Complete Plug-and-Play Kit: Includes preassembled hoses, fittings, harness, oil cooler core, and mounting brackets for easy installation.
- Performance Tested: Verified results at Fuji Speedway show stable oil temps (~130°C) with the HKS cooler versus ~150°C without it.
Benefits
- Extends the lifespan of transfer gears and oil.
- Maintains consistent power delivery during aggressive driving.
- Reduces thermal load on the drivetrain for improved reliability.
- Ideal for tuned or track-driven GR Corollas.
Compatibility
- Vehicle: Toyota GR Corolla (GZEA14H)
- Engine: G16E-GTS (1.6L Turbocharged)
- Model Years: 2023–2025
- Drivetrain: 4WD
Installation Notes
- Installation requires removal of underbody panels.
- Recommended to activate the system before sporty or track driving sessions.
- Not compatible with vehicles lacking the transfer protection control cancellation program unless specified.
- Estimated installation time: 5–6 hours.
Kit Includes
- Transfer oil cooler core and piping
- Electric oil pump
- Controller unit with harness
- Oil filter and bracket set
- Mounting hardware and hoses
- Instruction manual
Technical Specs
- Part Number: 27002-AT001
- Material: Aluminum core and steel fittings
- Designed For: High-performance temperature regulation of transfer unit
- Manufacturer: HKS Japan
Why Choose HKS
With decades of motorsports experience, HKS leads the aftermarket industry in performance and reliability. The Transfer Oil Cooler Kit is built to the same high standards trusted by professional racers and enthusiasts worldwide—offering peace of mind for spirited daily driving or full-on competition use.
To provide faster delivery and turn around time; Kami Speed ships products out from different warehouses throughout the United States. Usually averaging 1-4 business days for processing prior to shipping.
Depending on the package, we ship using different carriers according to the item's location, content, and size.
Freight truck & international items, will require up to 7 business days to ship due to size and logistics.
All orders made after 3:00pm ET will be processed the next business day.
Unless otherwise noted as "In Stock" with qty amount. Pre-Orders, Special orders, & Made to order items have an estimate of 5+ weeks for USA made parts and 10+ weeks for JDM/ Overseas parts. Please check with us for exact ETA as it will vary by brand and item.
Orders over $500 will ship insured and over $1,000 with signature and insurance in order to guarantee delivery. Orders over $1000 may not be able to ship to a different address not listed as the billing address or confirm payment address from the form of payment used. Orders with suite numbers, different billing, or apartment numbers will require signature if valued over $200.
All international orders outside of the USA are subject to duties and taxes fees per your countries jurisdiction and determined by customs.
Kami Speed serves the right to ship using an alternative method if we see it fit, in order to expedite shipping and reduce your rate depending on product value.
Processing and logistics on in stock international orders will take up to 7 business days to process & ship as sometimes we only have 1 international pickup a week.
In stock, non pre-orders or special order items can be returned within 30 days of the product arriving to your house or place of work.
Returns will NOT be accepted on Clearance Items, Final Sales, Special Orders, Pre-Orders, Opened, Installed, Incomplete, or Otherwise Used Products. In order to initiate a return, an RMA number must be requested and approved via e-mail. All returns will be subject to a 20% restocking fee minus complete shipping cost (roundtrip).
Any non credit card processed order will have a 6% cancelation fee to cover the loan processing or 3rd party merchant fee. No fee will be incurred if used as store credit.
For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.
WARNING: Operating, servicing and maintaining a passenger vehicle or off-highway motor vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to www.P65Warnings.ca.gov/passenger-vehicle.
HKS Toyota GR Corolla Transfer Case Oil Cooler Kit | 27002-AT001
