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USD 245.95
Part #: XD310

XDP X-TRA Cool Direct-Fit Transmission Oil Cooler XD310

2006-2010 GM 6.6L Duramax
Part #: XD310
★★★★★ ★★★★★ 10 Reviews
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Upgrade the factory transmission cooler in your 2006-2010 GM 6.6L Duramax LBZ/LMM with the XDP X-TRA Cool Direct-Fit Transmission Oil Cooler XD310. Manufactured to provide you with the ultimate in strength and durability, XDP’s X-TRA Cool Transmission Oil Coolers are made using techniques borrowed from the HD and semi-truck industry. X-TRA Cool Oil Coolers feature a high-efficiency core to maximize cooling potential for your Allison transmission. Each kit comes ready to install with the brackets, hardware, and necessary fittings to make this a bolt-on installation.

  • Direct-Fit
  • Replaces Factory Cooler 
  • Upgraded Design For Increased Durability 
  • High-Efficiency Core To Maximize Cooling 
XD310 Specifications:
Core Width: 20" 
Core Height: 4-5/8"
Core Thickness: 2" 
Overall Length: 23" 
Cooler Fittings: 7/8-14 UNF

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

Warranty Info:
Products manufactured by XDP carry a 1-Year warranty against defects in materials and craftsmanship. The Warranty is Limited to one (1) year from the date of sale and limited solely to the parts contained within the product's kit. Click Here for full warranty policy.

Vehicle Applications

2006 Chevy 6.6L LLY/LBZ Duramax
2007 Chevy 6.6L LLY/LBZ Duramax
2007.5 Chevy 6.6L LMM Duramax
2008 Chevy 6.6L LMM Duramax
2009 Chevy 6.6L LMM Duramax
2010 Chevy 6.6L LMM Duramax
2006 GMC 6.6L LLY/LBZ Duramax
2007 GMC 6.6L LLY/LBZ Duramax
2007.5 GMC 6.6L LMM Duramax
2008 GMC 6.6L LMM Duramax
2009 GMC 6.6L LMM Duramax
2010 GMC 6.6L LMM Duramax


  • MFG. Number XD310
  • Manufacturer Name XDP
  • Shipping Weight 7.00 lb.
  • Shipping Length 25 in.
  • Shipping Width 8 in.
  • Shipping Height 10 in.
  • Fuel Type Diesel
  • UPC 856217008496
  • Warranty Yes
  • Warranty Info 1 Year / Unlimited Mileage
  • Prop 65 WARNING: Cancer & Reproductive Harm -
  • Cross Reference # 15102153


★★★★★ ★★★★★
5.0/5 Stars out of 10 Reviews
Verified Buyer
Great product! 5Stars
(Jourdanton, Tx) | October 18th, 2021
First of all super fast shipping and packaged great to protect the fins. Everything lined up and bolted in just fine will definitely be returning here to order another one for my other truck as well.
Verified Buyer
Great Product!
(Freeland, Michigan) | September 24th, 2021
This transmission cooler was an easy direct fit install! The connectors fit way better than stock and you don’t have to worry about breaking them because they’re stronger than stock too. My trans even runs about 25 degrees cooler than stock! That’s because it has an extra layer of cooling as compared to stock! I’ve ordered a few other things from XDP before and have had zero problems, I will definitely be using them for anything and everything I need for my truck from here on out! Order #1520468
Verified Buyer
One of best upgrades I’ve done to my duramax
(OK) | September 10th, 2021
Installed on 2005 LLY. I ordered it factory transmission lines for a LBZ/LMM then mounted with room for future oil cooler. Couldn’t be happier with the build quality of the cooler. Temps take much longer to climb and rarely get to 200 unless a long trip or hauling. Order Number: 2156332 Website Order Number: 1512568
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Questions and Answers

Does the xdp trans cooler come with every thing needed for installation or will additional parts and fabrication be needed?
View Staff Answer 
The XDP X-TRA Cool Direct-Fit Transmission Oil Cooler XD310 comes as a direct-fit replacement with all components. No additional fabrication is needed.

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