{"product_id":"speed-stop-x-masonbilt-duramax-transmission-line-kit","title":"Duramax Transmission Cooler Line Kit 5\/8\" | Chevy Silverado \u0026 GMC Sierra 2001-2016","description":"\u003cp data-start=\"190\" data-end=\"249\"\u003e\u003cstrong\u003eBefore Ordering: Select the Correct Kit for Your Truck\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"315\" data-end=\"449\"\u003e\u003cstrong data-start=\"315\" data-end=\"449\"\u003eUse the reference photos below to identify your factory transmission cooler line configuration and select the matching kit option.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"454\" data-end=\"561\"\u003e\u003cstrong data-start=\"454\" data-end=\"561\"\u003eNot sure which kit you need? Send us your VIN or photos and we'll help verify fitment before you order.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"190\" data-end=\"249\"\u003e\u003cstrong data-start=\"190\" data-end=\"249\"\u003eStop Leaking Duramax Transmission Cooler Lines for Good\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"251\" data-end=\"516\"\u003eTired of leaking Duramax transmission cooler lines? Our upgraded 5\/8\" transmission cooler line kit replaces failure-prone factory lines on 2001-2016 Chevy Silverado and GMC Sierra Duramax trucks. Built to last and backed by our No Questions Asked Lifetime Warranty.\u003c\/p\u003e\n\u003cp data-start=\"518\" data-end=\"726\"\u003eLeaking transmission cooler lines are one of the most common issues on Duramax trucks. Factory lines can corrode, seep, or fail over time, leading to transmission fluid loss and potentially expensive repairs.\u003c\/p\u003e\n\u003cp data-start=\"728\" data-end=\"1098\"\u003eOur upgraded 5\/8\" Duramax Transmission Cooler Line Kit is designed to provide a reliable, long-lasting solution for Chevy Silverado and GMC Sierra HD trucks equipped with the Duramax diesel and Allison transmission. Whether you're fixing an active leak or replacing aging factory lines before they fail, this kit delivers the durability and performance your truck needs.\u003c\/p\u003e\n\u003ch3 data-start=\"1100\" data-end=\"1112\"\u003eFeatures\u003c\/h3\u003e\n\u003cp data-start=\"1113\" data-end=\"1401\"\u003e✔ Replaces failure-prone factory transmission cooler lines\u003cbr data-start=\"1171\" data-end=\"1174\"\u003e✔ Fits 2001-2016 Duramax diesel trucks\u003cbr data-start=\"1212\" data-end=\"1215\"\u003e✔ Compatible with Allison transmissions\u003cbr data-start=\"1254\" data-end=\"1257\"\u003e✔ High-quality fittings and components\u003cbr data-start=\"1295\" data-end=\"1298\"\u003e✔ Helps prevent transmission fluid leaks\u003cbr data-start=\"1338\" data-end=\"1341\"\u003e✔ Designed for long-term reliability\u003cbr data-start=\"1377\" data-end=\"1380\"\u003e✔ Easy installation\u003c\/p\u003e\n\u003ch3 data-start=\"1403\" data-end=\"1411\"\u003eFits\u003c\/h3\u003e\n\u003cp data-start=\"1412\" data-end=\"1555\"\u003e• LB7 Duramax (2001-2004)\u003cbr data-start=\"1437\" data-end=\"1440\"\u003e• LLY Duramax (2004.5-2005)\u003cbr data-start=\"1467\" data-end=\"1470\"\u003e• LBZ Duramax (2006-2007)\u003cbr data-start=\"1495\" data-end=\"1498\"\u003e• LMM Duramax (2007.5-2010)\u003cbr data-start=\"1525\" data-end=\"1528\"\u003e• LML Duramax (2011-2016)\u003c\/p\u003e\n\u003cp data-start=\"1557\" data-end=\"1648\"\u003e\u003cstrong data-start=\"1557\" data-end=\"1581\"\u003eVehicle Applications\u003c\/strong\u003e\u003cbr\u003e• Chevy Silverado 2500HD \u0026amp; 3500HD\u003cbr data-start=\"1615\" data-end=\"1618\"\u003e• GMC Sierra 2500HD \u0026amp; 3500HD\u003c\/p\u003e\n\u003cp data-start=\"1650\" data-end=\"1797\"\u003eDon't wait until a small leak becomes a costly transmission repair. Upgrade your Duramax transmission cooler lines today and drive with confidence.\u003c\/p\u003e\n\u003cp data-start=\"1650\" data-end=\"1797\"\u003e \u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eQ: Will this transmission cooler line kit fit my truck?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This kit fits select 2001-2016 Chevy Silverado and GMC Sierra HD trucks equipped with a Duramax diesel engine and Allison 1000 transmission. Use the fitment guide and reference photos above to select the correct kit. If you're unsure, send us your VIN and we'll verify fitment before you order.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eQ: What are the signs of a leaking Duramax transmission cooler line?\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Common symptoms include transmission fluid spots under the truck, wet or oily cooler lines, low transmission fluid levels, transmission overheating, and visible leaks around factory crimp connections.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eQ: Why do factory Duramax transmission cooler lines fail?\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003eA.\u003c\/strong\u003e Factory transmission cooler lines commonly fail due to corrosion, deteriorating crimp connections, age, and exposure to heat and road debris. These issues can lead to transmission fluid leaks and costly repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this kit work with Allison 1000 transmissions?\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003eA. \u003c\/strong\u003eYes. This kit is designed for Duramax trucks equipped with the Allison 1000 transmission.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eQ: Is this kit covered by a warranty?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA: \u003c\/strong\u003eYes. Our Duramax 5\/8\" Transmission Cooler Line Kits are backed by our No Questions Asked Lifetime Warranty.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong data-end=\"253\" data-start=\"197\"\u003eQ: Will this kit help stop transmission fluid leaks?\u003c\/strong\u003e\u003cbr data-end=\"256\" data-start=\"253\"\u003e\u003cstrong data-end=\"262\" data-start=\"256\"\u003eA:\u003c\/strong\u003e If your leak is coming from the factory transmission cooler lines, fittings, or crimp connections, this kit is designed to eliminate those common failure points and provide a long-lasting solution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong data-start=\"598\" data-end=\"635\"\u003eQ: What is included with the kit?\u003c\/strong\u003e\u003cbr data-start=\"635\" data-end=\"638\"\u003e\u003cstrong data-start=\"638\" data-end=\"644\"\u003eA:\u003c\/strong\u003e Each kit includes the components necessary to replace your factory transmission cooler lines. Components vary based on the selected year range and transmission cooler line configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-start=\"1799\" data-end=\"1839\"\u003eNo Questions Asked Lifetime Warranty\u003c\/h3\u003e\n\u003cp data-start=\"1840\" data-end=\"1928\"\u003eWe stand behind every kit we sell. If you ever experience an issue, we'll make it right.\u003c\/p\u003e\n\u003cp\u003eInstructions are available here:\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/masonbiltperformance.com\/blogs\/news\/masonbilt-x-speed-stop-5-8-duramax-transmission-cooler-line-set-installation-instructions\" rel=\"noopener\" target=\"_blank\"\u003ehttps:\/\/masonbiltperformance.com\/blogs\/news\/masonbilt-x-speed-stop-5-8-duramax-transmission-cooler-line-set-installation-instructions\u003c\/a\u003e\u003cimg\u003e\u003c\/p\u003e","brand":"Masonbilt Performance","offers":[{"title":"2001-2002 LB7 \/ Yes","offer_id":52557703217431,"sku":null,"price":290.0,"currency_code":"USD","in_stock":true},{"title":"2001-2002 LB7 \/ No","offer_id":52715315626263,"sku":null,"price":290.0,"currency_code":"USD","in_stock":true},{"title":"2003-2005 LB7\/LLY \/ Yes","offer_id":52557703282967,"sku":null,"price":290.0,"currency_code":"USD","in_stock":true},{"title":"2003-2005 LB7\/LLY \/ No","offer_id":52715315659031,"sku":null,"price":290.0,"currency_code":"USD","in_stock":true},{"title":"2006-2010 LBZ\/LMM \/ Yes","offer_id":52557703381271,"sku":null,"price":280.0,"currency_code":"USD","in_stock":true},{"title":"2006-2010 LBZ\/LMM \/ No","offer_id":52715315691799,"sku":null,"price":280.0,"currency_code":"USD","in_stock":true},{"title":"2011-2014 LML \/ Yes","offer_id":52696672960791,"sku":null,"price":320.0,"currency_code":"USD","in_stock":true},{"title":"2011-2014 LML \/ No","offer_id":52715315724567,"sku":null,"price":320.0,"currency_code":"USD","in_stock":true},{"title":"2015-2016 LML \/ Yes","offer_id":52696673026327,"sku":null,"price":320.0,"currency_code":"USD","in_stock":true},{"title":"2015-2016 LML \/ No","offer_id":52715315757335,"sku":null,"price":320.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/7135\/0807\/files\/Bothlogo1.webp?v=1782587324","url":"https:\/\/masonbiltperformance.com\/products\/speed-stop-x-masonbilt-duramax-transmission-line-kit","provider":"Masonbilt Performance","version":"1.0","type":"link"}