{"title":"GMC\/Chevrolet Cooling Systems","description":"\u003cp\u003eHigh-flow transmission thermal bypass valve kit for the GMC\/Chevy 6.6L Duramax.\u003c\/p\u003e\n\u003ch2\u003eSteadier Transmission Temps\u003c\/h2\u003e\n\u003cp\u003eThe factory transmission thermal bypass can let fluid run hotter than you want, especially towing. This high-flow thermal bypass valve kit improves how the Duramax manages transmission fluid temperature for steadier, cooler trans temps.\u003c\/p\u003e\n\u003ch3\u003eFits these trucks\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2017–2025 GMC\/Chevy 6.6L Duramax — high-flow transmission thermal bypass valve kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does a thermal bypass valve kit do?\u003c\/strong\u003e\u003cbr\u003eIt improves how the transmission manages fluid temperature, giving steadier, cooler trans temps — especially under towing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need it?\u003c\/strong\u003e\u003cbr\u003eIf you tow or want tighter control of transmission temperature on a newer Duramax, it's a worthwhile upgrade.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my truck?\u003c\/strong\u003e\u003cbr\u003eFits the 2017–2025 6.6L Duramax. Match your year on the product page. Get the right part the first time.\u003c\/p\u003e","products":[{"product_id":"high-flow-transmission-thermal-bypass-valve-kit-for-2017-2025-chevy-gmc-6-6l-l5p","title":"High Flow Transmission Thermal Bypass Valve Kit For 2017-2025 Chevy GMC 6.6L L5P","description":"\u003cp\u003eHigh Flow Transmission Thermal Bypass Valve Kit for 2017–2025 Chevrolet and GMC trucks with Silverado\/Sierra 2500HD and 3500HD equipped with the 6.6L L5P Duramax diesel and Allison transmission. This kit eliminates the internal thermostat, providing full fluid flow to the transmission cooler in all running conditions. Strategically machined internal passages provide improved flow over the stock valve for more effective cooling, and cooling fins machined into the valve body add even more heat dissipation.\u003c\/p\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 Chevrolet\/GMC Silverado\/Sierra 2500HD and 3500HD -- 6.6L L5P Duramax Diesel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e CNC-machined aluminum thermal bypass valve\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black anodized\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFittings:\u003c\/strong\u003e Two 7\/8-inch X 14 quick-disconnect transmission line fittings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFeatures:\u003c\/strong\u003e Includes removable thermostat for fast warm-up in cold climates and thermostat bypass for constant cooling in warm climates or extreme driving\/towing conditions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Fits with stock transmission cooler piping, requiring no modification for installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeat Management:\u003c\/strong\u003e Strategically machined internal passages and integrated heat-sink fins provide improved flow and added heat dissipation over stock units\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Mishimoto Lifetime Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eDirect fit for 2017+ Chevrolet\/GMC 6.6L Duramax L5P with stock transmission cooler piping requiring no modification. Installation is straightforward and can be completed by a technician in under one hour.\u003c\/p\u003e\n\n\u003cp\u003eCheck local emissions regulations before purchase. Professional installation is recommended.\u003c\/p\u003e\n\n\u003cp\u003eGet the right part the first time.\u003c\/p\u003e","brand":"Performance Parts Factory","offers":[{"title":"Default Title","offer_id":52915773899061,"sku":"GM-503-1725","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/5036\/3957\/files\/GM-503-1725-1.webp?v=1780531619"}],"url":"https:\/\/www.performancepartsfactory.com\/collections\/gmc-chevrolet-cooling.oembed","provider":"Performance Parts Factory","version":"1.0","type":"link"}