HKS Transfer Case Oil Cooler Kit for Toyota GR Corolla 2023-2025

How much transfer oil does it take with the kit installed?

• The transfer case takes 0.8 L of transfer oil with the kit, up from 0.45 L stock. After filling, run the pump for about a minute and top up again; the first fill may need this twice.

Does anything on the car have to be modified?

• Yes. The reinforcement and the intercooler air guide are modified, and on cars built after March 2025 the undercover as well. Vinyl, harness, insulation and sealing tape are needed and not included.

Does it matter whether my car has the transfer protection cancel program?

• Yes, the pump controller is wired and works differently depending on whether the car has the factory Transfer Protection Control Cancel Program. On cars without it the select switch is left unconnected and 4WD mode switching is not possible.

What tools does the install need?

• Electric pliers and a rivet nut tool are needed, along with a factory service manual for removing the stock parts.

Shipping

• In stock orders typically ship within 1 to 3 business days.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Special order items follow a lead time we confirm with you individually before the order is committed.
• Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
• Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
• Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
• Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
• Product images may be representative. The SKU and specifications in the listing are what ships.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty