HKS Transfer Case Oil Cooler Kit – 2020–2026 Toyota GR Yaris (GXPA16) | GR-Four AWD System

Eliminate one of the GR Yaris's most critical thermal management limitations with the HKS Transfer Case Oil Cooler Kit — engineered specifically for the 2020–2026 Toyota GR Yaris (GXPA16) and its GR-Four torque-vectoring AWD system. Under sustained track use and high-performance driving, the GR Yaris's GR-Four transfer case generates significant heat — a well-documented thermal management issue that causes the AWD system to reduce torque delivery to protect itself from overheating. The HKS transfer case oil cooler provides the additional cooling capacity needed to keep transfer case oil temperatures in the optimal operating range, maintaining full GR-Four AWD performance and torque vectoring capability throughout sustained hard driving.

Key Features

• Prevents GR-Four AWD Thermal Limiting: The GR Yaris's GR-Four transfer case is a known thermal management weak point under sustained track use — elevated transfer case oil temperatures cause the AWD system to reduce torque delivery to protect itself. The HKS transfer case oil cooler directly addresses this limitation, maintaining full AWD performance and torque vectoring capability throughout sustained hard driving
• Transfer Case Specific – Not Engine Oil: This kit cools the GR-Four transfer case oil — a separate and distinct cooling circuit from the engine oil cooler (15004-AT114). Both are recommended for serious track use on the GR Yaris
• Consistent AWD Performance: Keeps transfer case oil temperatures in the optimal operating range for consistent GR-Four torque vectoring performance lap after lap — critical for competitive track driving where AWD thermal limiting causes unpredictable handling behavior
• Gen1 & Gen2 Coverage: Fits the full 2020–2026 GR Yaris GXPA16 production run — compatible with both Gen1 (2020–2023) and Gen2 (2024–2026) models
• Complete Kit: Includes all components required for installation — oil cooler core, lines, fittings, and mounting hardware for a complete installation
• HKS Engineering & Quality: Manufactured by HKS — Japan's leading performance tuning brand with decades of motorsport and street performance engineering expertise, trusted by professional racing teams and enthusiasts worldwide

Specifications

• Type: Transfer Case Oil Cooler Kit
• Application: GR-Four AWD Transfer Case
• Fitment: 2020–2026 Toyota GR Yaris (GXPA16) — Gen1 & Gen2
• Part Number: 27002-AT002

Note: This kit cools the GR-Four transfer case oil only — not the engine oil. For engine oil cooling, see HKS S-Type Oil Cooler Kit (15004-AT114). Both kits are recommended for serious track use on the GR Yaris. Professional installation by an experienced performance shop is strongly recommended — improper installation can result in oil leaks and drivetrain damage. A transfer case oil change is recommended after installation.