The XDP Xtra Cool Direct-Fit Transmission Oil Cooler XD309 is a direct upgrade for the factory transmission oil cooler in your 2001-2005 GM 6.6L Duramax LB7/LLY. 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, the D309 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 powertrain.

Application Notes:

• XDP cannot guarantee fitment with all aftermarket transmission lines.
• Please match aftermarket lines with the cooler fittings specified above.

• Direct-Fit|
• Replaces Factory Cooler
• Upgraded Design For Increased Durability
• High-Efficiency Core To Maximize Cooling

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