The factory Pontiac G8 transmission cooling system leaves a lot to be desired—especially once power levels increase, towing is involved, or the vehicle sees aggressive street and track use. The OEM cooler is integrated into the bottom tank of the radiator and offers limited cooling capacity when compared to a dedicated external cooler.

That’s why we developed the G8Only Heavy-Duty Transmission Cooler Kit.

Built around the proven Derale 33604 Plate & Fin Cooler, this kit completely bypasses the factory radiator cooler and replaces it with a dedicated 23,500 BTU transmission cooler system designed to keep transmission temperatures under control in demanding conditions.

Unlike universal cooler kits that leave customers guessing which fittings, hose sizes, and adapters are required, this package includes everything needed to install the cooler on your Pontiac G8. We’ve already done the research and assembled the correct components into one complete solution.

At the heart of the system is the Derale 33604 cooler, featuring furnace-brazed aluminum construction, high-efficiency turbulators, and a low-restriction plate-and-fin design. This combination maximizes heat transfer while minimizing pressure drop, helping maintain proper fluid flow and transmission performance.

By reducing operating temperatures, this system helps:

• Extend transmission life
• Improve shift consistency
• Reduce heat-related transmission wear
• Improve reliability in high-performance applications
• Maintain more stable transmission temperatures during towing and spirited driving

Whether you’re running a stock daily driver, a cammed street car, a boosted setup, or a dedicated track build, proper transmission cooling is one of the best investments you can make for long-term reliability.

Most transmission failures start with excessive heat. This kit is designed to stop that problem before it starts.