Xtra Cool Direct-Fit Transmission Oil Cooler XD309



2001-2005 GM 6.6L Duramax LB7/LLY


  • Direct Fit
  • Replaces Factory Cooler
  • Upgraded Design for Increased Durability
  • High Efficiency Core to Maximize Cooling
  • 1 Year Warranty


  • Core Width: 12-1/2″
  • Core Height: 7-3/4″
  • Core Thickness: 2″
  • Overall Length: 16″
  • Cooler Fittings: 7/8-14 UNF


While most aftermarket transmission coolers are a universal, remote mount design, this unit is a direct replacement for your worn cooler. If your Allison transmission is asking for a cool off, look no further than this heavy duty unit.

XDP’s XTRA-Cool Transmission Oil Coolers are made using techniques borrowed from the HD and semi-truck industry to provide you with the ultimate in strength and durability. Built for more than just increased strength, this trans cooler features a high-efficiency core that is specially designed to maximize transmission cooling potential over the factory unit. Each kit comes ready to install with the needed fittings, brackets, and hardware to make this a bolt-on installation for your GM Duramax/Allison powetrain.

Additional information

Weight 8.6 lbs
Dimensions 18.9 × 13.4 × 3.6 in


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