{"title":"2020-2026 GM 2500HD\/3500HD 6.6L L5P Duramax Complete Transmissions","description":"\u003cdiv\u003e\n\u003cinput type=\"checkbox\" class=\"read-more-state\" id=\"post-1\"\u003e\n\u003cp class=\"read-more-wrap\"\u003eThe factory transmission in your 2020-2026 GM 6.6L Duramax L5P can quickly become a weak point once you've stacked on high levels of horsepower and torque. Instead of upgrading individual components, a complete aftermarket transmission offers a more complete solution. Specifically designed to handle massive power, these premium transmissions are built for both durability and performance, ensuring your GM Sierra\/Silverado 2500HD\/3500HD can keep up with your engine modifications.\u003cspan class=\"read-more-target\"\u003e \u003cspan class=\"headerspam\"\u003e\u003cstrong\u003eGM Duramax Fitments:\u003c\/strong\u003e 2020, 2021, 2022, 2023, 2024, 2025, 2026 GM 6.6L Duramax.\u003c\/span\u003e \u003cspan class=\"headerspam\"\u003e\u003cstrong\u003eSubmodel Fitments:\u003c\/strong\u003e WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali.\u003c\/span\u003e \u003cspan class=\"headerspam\"\u003eSome exceptions apply, please see individual product pages for specific fitments.\u003c\/span\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003clabel for=\"post-1\" class=\"read-more-trigger\"\u003e\u003c\/label\u003e\n\u003c\/div\u003e","products":[{"product_id":"suncoast-category-1-transmission-with-deep-pan-20-24-gm-6-6l-duramax","title":"SunCoast SC-10L1000-CAT1-4WD-LC Category 1 Transmission with Deep Pan | 2020-2026 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax L5P","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWithstands high horsepower and torque loads\u003c\/li\u003e\n\u003cli\u003eEnhanced shift performance and clutch durability\u003c\/li\u003e\n\u003cli\u003eDeep cast aluminum pan with 4 quarts extra capacity for better cooling\u003c\/li\u003e\n\u003cli\u003eTested and recalibrated valve body assembly for precise control\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eDirect fit replacement”no modifications required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eUnleash Unrivaled Power and Durability\u003c\/h4\u003e\n\u003cp\u003eUpgrade your 2020-2026 GM 6.6L Duramax with the SunCoast Category 1 Transmission with Deep Pan, a next-generation powerhouse designed to withstand extreme workloads. Built for towing, hauling, and high-performance driving, this transmission is engineered for longevity and efficiency, ensuring your truck operates at peak performance under the harshest conditions. Featuring Raybestos Powertrain GPZ frictions, steels, and an advanced deep cast aluminum pan, this upgrade enhances torque capacity, shift quality, and heat dissipation”so you can work harder and drive further with confidence.\u003c\/p\u003e\n\u003ch4\u003ePrecision Engineering for Maximum Performance\u003c\/h4\u003e\n\u003cp\u003eThe SunCoast Category 1 transmission undergoes a meticulous rebuild process, replacing all worn components with high-quality, high-performance materials to maximize reliability and durability. The included 10L1000 Deep Cast Aluminum Pan increases fluid capacity by 4 quarts over stock, with a finned design for superior heat dissipation. The Raybestos GPZ friction plates and precision-machined steel clutch plates provide smoother shifts, greater torque handling, and increased longevity. Designed to be a direct fit replacement, this transmission installs seamlessly with no modifications needed, allowing you to get back on the road with minimal downtime.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment:\u003c\/strong\u003e 2020, 2021, 2022, 2023, 2024, 2025, 2026 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax L5P\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e$3,500.00 Refundable Core Charge\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SunCoast Performance","offers":[{"title":"Default Title","offer_id":51154533220636,"sku":"SUNSC-10L1000-CAT1-4WD-LC","price":8827.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2279\/8108\/files\/SUNSC-10L1000-CAT1-4WD-LC_1.jpg?v=1738173485"},{"product_id":"suncoast-sc-10l1000-cat2-4wd-lc-category-2-transmission-with-expanded-e-f-capacity-and-deep-pan-20-24-gm-6-6l-duramax","title":"SunCoast SC-10L1000-CAT2-4WD-LC Category 2 Transmission with Expanded E \u0026 F Capacity and Deep Pan | 2020-2026 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax L5P","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-performance overhaul kit for a complete transmission rebuild\u003c\/li\u003e\n\u003cli\u003e4140 steel dowels replace weak OEM cast aluminum engagement points\u003c\/li\u003e\n\u003cli\u003eDeep cast aluminum pan with 4-quart extra capacity for better cooling\u003c\/li\u003e\n\u003cli\u003eDirect bolt-in replacement”no machining or modifications required\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eBuilt for Extreme Workloads and Heavy Towing\u003c\/h4\u003e\n\u003cp\u003eTake your 2020-2026 GM 6.6L Duramax to the next level with the SunCoast SC-10L1000-CAT2-4WD-LC Category 2 Transmission with Expanded E \u0026amp; F Capacity and Deep Pan. Designed for heavy-duty applications, this transmission upgrade delivers exceptional torque handling, enhanced shift quality, and superior durability. Whether you're towing, hauling, or pushing your truck to its limits, the expanded clutch capacity and advanced billet components ensure unmatched reliability and efficiency. With a deep cast aluminum pan for optimal heat dissipation, this transmission is built to keep you on the road and out of the shop.\u003c\/p\u003e\n\u003ch4\u003eInnovative Design, Unmatched Reliability\u003c\/h4\u003e\n\u003cp\u003eBuilt to exceed factory limitations, the SunCoast Category 2 10L1000 transmission features a 29% increased clutch capacity in the E drum, a 25% upgraded F clutch, and reinforced D clutch components. The billet T6061 aluminum apply piston minimizes deflection, while 4140 steel dowels eliminate OEM weak points, preventing premature wear. The Raybestos GPZ friction clutches and precision steel clutch plates ensure smoother shifts, greater torque capacity, and extreme durability. The direct-fit design allows for seamless installation, requiring no modifications, so you can upgrade with confidence and keep your truck running stronger, longer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment:\u003c\/strong\u003e 2020, 2021, 2022, 2023, 2024, 2025, 2026 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax L5P\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRefundable $3,500 core charge applies\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SunCoast Performance","offers":[{"title":"Default Title","offer_id":51155110199580,"sku":"SUNSC-10L1000-CAT2-4WD-LC","price":10277.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2279\/8108\/files\/SUNSC-10L1000-CAT2-4WD-LC_1.jpg?v=1738180159"},{"product_id":"suncoast-sc-10l1000-cat2-4wd-lc-category-2-transmission-with-pro-loc-valve-body-combo-and-deep-pan-20-24-gm-6-6l-duramax","title":"SunCoast SC-10L1000-CAT3-4WD-LC Category 3 Transmission with Pro-Loc Valve Body Combo and Deep Pan | 2020-2026 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax L5P","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePro-Loc Valve Body \u0026amp; Pump Combo for faster lock-up apply I\u003c\/li\u003e\n\u003cli\u003eImproved clutch engagement, and enhanced cooling\u003c\/li\u003e\n\u003cli\u003eDeep Cast Aluminum Pan adds 4 quarts of extra capacity\u003c\/li\u003e\n\u003cli\u003e250% Increase in Cooler Charge Pressure\u003c\/li\u003e\n\u003cli\u003eFully assembled unit requires no machining or modifications\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eUpgrade with Confidence - More Strength, More Durability\u003c\/h4\u003e\n\u003cp\u003eTransform your 2020-2026 GM 6.6L Duramax with the SunCoast Category 2 Transmission and experience superior power, durability, and towing confidence. Whether you're hauling heavy loads, tackling tough terrain, or pushing your truck to its limits, this transmission is built to handle it all. With a Pro-Loc Valve Body Combo and Deep Pan, you get enhanced performance, reduced heat buildup, and extended clutch life, ensuring reliability under the most demanding conditions. SunCoast's precision-engineered design minimizes breakdowns, reduces maintenance costs, and keeps you on the road longer. If you're looking for a practical yet high-performance upgrade, this transmission delivers next-level capability with seamless installation.\u003c\/p\u003e\n\u003ch4\u003eEngineered for Extreme Performance\u003c\/h4\u003e\n\u003cp\u003eBuilt from the ground up with industry-leading components, the SunCoast Category 3 Transmission is a powerhouse of innovation. Featuring Raybestos GPZ Frictions and Steels, a reinforced Expanded Capacity E-Clutch Drum, and a Pro-Loc Valve Body, this transmission provides 29% more clutch capacity than stock and drastically improves shift precision and holding power. The deep cast aluminum pan increases fluid capacity by four quarts for superior cooling, while billet components eliminate weak points found in OEM designs. Optimized for higher torque loads, this transmission boasts a 250% increase in cooler charge pressure and 60 PSI additional line pressure for firmer, more responsive shifts. Whether you're working, towing, or racing, the SunCoast Category 3 is designed to maximize power transfer and keep your truck running at peak performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment:\u003c\/strong\u003e 2020, 2021, 2022, 2023, 2024, 2025, 2026 GM Silverado\/Sierra 2500HD\/3500HD 6.6L Duramax L5P\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRefundable $3,500 core charge applies.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SunCoast Performance","offers":[{"title":"Default Title","offer_id":51155364643100,"sku":"SUNSC-10L1000-CAT3-4WD-LC","price":10665.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2279\/8108\/files\/SUNSC-10L1000-CAT3-4WD-LC_1.jpg?v=1738182487"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2279\/8108\/collections\/GM_Duramax_Complete_Transmission_Thumb_1.jpg?v=1728498189","url":"https:\/\/www.alligatorperformance.com\/collections\/2020-2026-gm-duramax-66l-l5p-complete-transmissions.oembed","provider":"Alligator Performance","version":"1.0","type":"link"}