INSTALLATION INSTRUCTIONS

The COOLMASTER 49478KHD is the heavy-duty variant of our premium 49478K Heavy Duty Single Core Transmission Cooler Kit, built to meet the extreme cooling demands of modern diesel drivetrains in the Mazda BT-50 TF, Isuzu D-MAX RG, and Isuzu MU-X RJ. Tailored for the RZ4E-TC 1.9L and 4JJ3-TCX 3.0L Turbo Diesel engine and 6-speed AC60 transmission, this kit is designed for serious towing, off-road touring, and high-performance work environments.

Compared to the standard 49478K, this HD version features reinforced cooling components and optimized flow design for even greater thermal control — perfect for vehicles operating under constant heavy loads or in high ambient temperatures.

Key Features:

• Heavy Duty Single Core Cooler – Increased thickness and capacity for maximum heat rejection compared to 49478K
• Designed for High-Load Applications – Ideal for towing, remote touring, and hot climates
• Engineered for the AC60 Transmission – Protects against heat stress during prolonged use
• Fitment for BT-50, D-MAX & MU-X – Suits latest 3.0L diesel models from Mazda and Isuzu
• Complete HD Kit – Comes with robust brackets, reinforced fittings, and premium-grade braided hoses
• Prolongs Transmission Health – Maintains stable fluid temperatures and reduces wear

If you demand the toughest cooling for the harshest conditions, the COOLMASTER 49478KHD is the professional-grade solution trusted by serious off-roaders, towers, and fleet operators.