Excess heat is the #1 killer of transmissions. For individuals who tow, race or simply run their diesel hard, proper cooling of your transmission fluid is one of the most important things that you can do to increase the life of your transmission. When the mainline pressure is increased with upgrades such as a high-performance transmission kit, your transmission generates additional heat. A PPE Performance Transmission Cooler is critical in such situations.

6.6L Duramax Performance Transmission Cooler, 03-05 GM, Purple Clips

PPE’s Performance Transmission Cooler is a direct bolt-on replacement part that lowers the fluid temperatures up to an additional 20 to 30 degrees over the stock unit and comes with a limited lifetime warranty.

6.6L Duramax Performance Transmission Cooler, 03-05 GM, Purple Clips

Note: 2001-2005 Allison 1000/2000 Duramax/Gas Engines.

Before removing the factory transmission cooler from your truck check the color of the clips in the fittings that connect the transmission cooler to the cooler lines.

Use PPE part number (124060000) for 2001-2003 Cooler - connectors with Orange Clips.

Use PPE part number (124060300) for 2003-2005 Cooler - connectors with Purple Clips.

6.6L Duramax Performance Transmission Cooler, 03-05 GM, Purple Clips

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Transmission Coolers

2001-2003 GM 6.6L Duramax Performance Transmission Cooler Orange Clips