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XD309 XDP X-Tra Cool Transmission Oil Cooler - GMC/Chevy 6.6L Duramax 2001-2005

SKU: XD309
Mftr. Part#: XD309
UPC: 856217008489
The XDP X-Tra Cool Transmission Oil Cooler is a direct fit upgrade for the factory transmission oil cooler in your 2001-2005 GMC/Chevy 6.6L Duramax truck.

PRODUCT DETAILS (click to expand)

Mftr. Part#XD309

PRODUCT SPECS (click to expand)

Attribute nameAttribute value
Truck Type/ModelDuramax
Product TypeTransmission Cooler
BrandXDP (Xtreme Diesel Performance)


XDP's X-Tra Cool Transmission Oil Cooler is made using techniques borrowed from the heavy duty/semi truck industry to provide the ultimate strength and durability. Built for more than just increased strength they feature 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 an easy bolt-on installation.


  • 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