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  • HKS [Toyota GR Corolla] Transfer Case Oil Cooler Kit | 27002 - AT001 - JDMuscleOil Control Deviceshks27002-AT001
  • HKS [Toyota GR Corolla] Transfer Case Oil Cooler Kit | 27002 - AT001 - JDMuscleOil Control Deviceshks27002-AT001

HKS

HKS

Transfer Case Oil Cooler Kit | 27002-AT001

Fits: Toyota GR Corolla

$1,98500
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HKS Transfer Case Oil Cooler Kit | 27002-AT001
Fits: Toyota GR Corolla

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Fitment

Description

HKS Toyota GR Corolla Transfer Case Oil Cooler Kit

Monitors and controls transfer oil temperature during high-load continuous driving to protect the transfer unit.

What is Transfer Unit?

  • It is installed at the rear of the engine and changes the direction of the driving force coming from the transaxle differential case by 90 degrees before sending it to the rear wheels.
  • In the 4WD systems used in the GR Corolla, an electronically controlled coupling located in front of the rear differential adjusts the power sent to the rear wheels.
  • The system constantly fine-tunes the power distribution to achieve the ideal balance for each driving mode (NORMAL, GRAVEL, TRACK).

Product Overview

  • On the GR Corolla, the transfer system switches to 2WD during continuous high-load driving to prevent overheating.
  • The HKS TRANSFER OIL COOLER helps maintain lower transfer oil temperatures, extends oil life, and protects the transfer unit.
  • For vehicles equipped with the Transfer Protection Cancel Program, full-time 4WD is available even during circuit driving by disabling the limp mode, which switches to 2WD. *(Using the cancel program may void the vehicle’s warranty. Please check your warranty terms.)

Vehicles equipped with transfer protection control cancellation program

  • Japan model: Mar/2025 –
  • North American model: Aug/2024 -

※Vehicles manufactured from Aug/2020 to Dec/2020 do not feature Transfer Protective Control. 
For details, please contact the store where you purchased the vehicle.

Components

Transfer cooler pipe Oil filter
Oil pump Mounting bracket
Oil pump controller Hose, harness, and short parts set

 

Features

  • The dedicated pipe-type cooler ensures the transfer oil is cooled without affecting engine coolant, engine oil, or I/C cooling performance. The bracket fixing the cooler is designed to avoid obstructing airflow to the radiator and intercooler.
  • HKS uses a high-load, high-flow electric oil pump, controlled by a dedicated pump controller. If the pump is operated when the oil temperature is low (high viscosity), the overcurrent protection control puts it in standby mode and automatically restarts once the oil temperature reaches an appropriate level. It’s recommended to operate the pump when the oil temperature is above 60°C to prevent overloading.
  • For vehicles equipped with a transfer protection control cancellation program, selecting the TRACK mode within 1 minute of engine startup automatically activates the pump. The pump's operating status can be checked on the controller display. The kit includes wiring from the power source to the electric pump.
  • The transfer oil outlet uses a specially designed banjo-type attachment that is resistant to impact damage. The banjo bolt has a PT1/8 plug hole, allowing for oil changes without removing the bolt, and can also be used as a temperature sensor mounting hole.
  • Pump Controller Function
  • Operating modes
    • AUTO mode (for vehicles without a transfer protection control cancellation program)
    • FULL AUTO mode (for vehicles with a transfer protection control cancellation program)
    • MANUAL mode (for maintenance)
  • Current value monitoring function
    • When the pump current is above the rated value, it goes into standby mode. During standby, it operates the pump for 3 seconds every 30 seconds to monitor the current value
  • Overcurrent protection function
    • Transfer protection control cancellation function (only valid for vehicles with a transfer protection control cancellation program)
    • The transfer protection control cancellation function can be used by connecting the vehicle's "4WD mode select switch" connector to the pump controller.

Shipping and Delivery

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Warranty and Support

Limited Manufacturer Warranty

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