Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve KitBrand Mishimoto Part Number MMTC L5P TBVFF Category Cooling Transmission Coolers Condition Brand New Original Manufacturer Packaging The Allison transmission is the backbone of your L5P Duramax. It's responsible for transmitting large quantities of torque from your V8 diesel powerplant. This torque generates a lot of heat, and if that heat isn't dissipated, it can destroy your transmission. The transmission cooler does a good job of keeping trans
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