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Tru-Cool Max transmission cooler P/N LPD4739. This cooler is rated at 40,000 GVW and measures 8.5"x22.75"x1.25". This is a stacked plate, low pressure drop unit. This cooler has 3/8" inverted flare fittings and comes with a thermal bypass valve so you can use this cooler in cold weather and the fluid will bypass until the transmission comes up to operating temperatures. This is the ultimate cooler for heavy towing and is a must for heavy duty applications, including racing. Heat is what kills an automatic transmission. If you want to extend the life of your transmission and avoid or prolong a costly rebuild, this is very cheap insurance. All parts and instructions are included to mount and plumb this cooler.