{"product_id":"6l80-performance-transmission-rebuild-kit-cdt-level-4","title":"6L80 Performance Transmission Rebuild Kit - CDT Level 4","description":"\u003cdiv class=\"product-name\"\u003e\n\u003cdiv class=\"product-name\"\u003e\n\u003cdiv class=\"product-name\"\u003e\n\u003ch1\u003e6L80 Performance Transmission Rebuild Kit - CDT Level 4\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"short-description\"\u003eFREE UPS Ground to the contiguous United States (lower 48) | NO core required for output carrier\u003cbr\u003e\u003cbr\u003eRated up to 1000 RWHP, this kit is engineered for high-powered builds demanding superior transmission durability and reliability. While horsepower ratings are influenced by various factors such as tuning, vehicle weight, power adders, and driving conditions, this kit delivers proven performance for serious applications.\u003cbr\u003e\u003cbr\u003eDesigned specifically for 6L80 transmissions, this package features high-capacity 45-tooth 4-5-6 clutch plates for improved engagement and reduced clutch failure under heavy load. It also includes CDT’s Billet 4-5-6 clutch hub and intermediate shaft (CDT part number 104680-45), engineered for enhanced control and maximum torque handling. The upgraded 4-5-6 clutch pack provides 50% more surface area than stock, while the 3-5-R clutch pack offers an additional 50% increase in clutch area, boosting both power transfer and longevity.\u003cbr\u003e\u003cbr\u003eBuilt to optimize the performance of GM’s six speed automatic transmission, this kit is ideal for users experiencing slipping, overheating, or clutch-related issues under stress. For complete system integrity, it pairs well with a high-performance torque converter, precision calibration of the transmission control module, and premium transmission fluid. All components are manufactured with a focus on quality, ensuring they can be confidently replaced and trusted in even the most demanding applications.\u003c\/div\u003e\n\u003cdiv class=\"availability\"\u003e\n\u003cdiv class=\"stock\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"availability\"\u003eIn stock items ship within 1-2 business days.\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pictureRep\"\u003e\u003cem\u003ePicture for representation purposes only. Actual contents may vary as we continue to develop our products.\u003c\/em\u003e\u003c\/div\u003e\n\u003cdiv class=\"attributes\"\u003e\n\u003cdiv class=\"attribute-description\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThis performance transmission kit comes with printed instructions for all of the items in the kit except for the Sonnax items. For installation instructions for Sonnax items, \u003ca href=\"https:\/\/www.sonnax.com\/in\"\u003eclick here\u003c\/a\u003e.\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"attributes\"\u003e\n\u003cdiv class=\"attribute-description\"\u003e\n\u003cdiv\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan data-color=\"var(--purple-10)\"\u003e6L80 CDT-BROC: Reinforced Output Carrier for High-Powered Applications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003e6L80 CDT-BROC (4140 HTSR Billet Reinforced Output Carrier) | NO core required for output carrier\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eThe 6L80 CDT-BROC is a performance-engineered output carrier specifically built for 6L80 transmissions in high-powered applications. Designed for vehicles producing over 750 RWHP—including heavy-duty trucks, SUVs, CTS-Vs, and nitrous-assisted builds—this component delivers exceptional strength, reliability, and longevity under extreme load conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eMachined from 4140 HTSR (Heat Treated Stress Relieved) billet steel, the carrier offers increased hardness and high strength, which minimizes distortion and improves wear resistance during high-torque operations. This material choice significantly reduces the risk of clutch failure, stress fractures, and spline stripping, all common concerns when upgrading six-speed automatic transmissions for high-horsepower use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eThe billet steel drive plate has been precision-milled and contoured to fit seamlessly with the planetary housing, virtually eliminating the possibility of separation under dynamic loads.\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eAs a drop-in part, installation is quick and efficient, with no need for a core return. For builders and technicians seeking OEM+ quality, improved power handling, and upgraded transmission components, the CDT-BROC is a trusted choice—engineered to meet demanding performance specifications while offering long-term reliability.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch2\u003e\u003cspan\u003e\u003cstrong\u003eCDT456L4\/80 (4-5-6 CLUTCH KIT)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e(7) Alto G3® Clutches\u003c\/li\u003e\n\u003cli\u003e(9) Heat-Treated Steels (varying thicknesses)\u003c\/li\u003e\n\u003cli\u003e(1) Stepped Apply Plate\u003c\/li\u003e\n\u003cli\u003e(1) Wide Backing Plate\u003c\/li\u003e\n\u003cli\u003e(1) Snap Ring\u003c\/li\u003e\n\u003cli\u003e(2) Hi-Per Blue® Bonded Pistons\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCDT456L4\/80 offers 50% more clutch apply area than stock. G3® friction material is formulated to achieve minimal wear and maximize heat resistance. Our steels are heat-treated and cooled in air, producing a stable and consistent plate that resists warping and ensures smooth clutch operation. This process improves durability and promotes even wear when paired with premium friction materials. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance, with better fit and performance.\u003c\/p\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan data-color=\"var(--purple-10)\"\u003e104680-45: Billet Intermediate Shaft \u0026amp; 4-5-6 Clutch Hub for 6L80 Transmission Performance\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003e104680-45 (One-Piece Billet Intermediate Shaft \u0026amp; 4-5-6 Clutch Hub)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eThe 104680-45 billet intermediate shaft and clutch hub is a critical upgrade for maximizing performance and durability in 6L80 transmissions, especially in high-horsepower builds. Forged from premium 300M billet steel, this component is heat-treated and shot-peened to deliver unmatched strength, fatigue resistance, and long-term reliability under extreme torque and temperature conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eEngineered as a one-piece design, the shaft eliminates common failure points seen in multi-piece factory shafts. It significantly boosts transmission performance by doubling oil flow to the 4-5-6 clutch pack, enhancing heat resistance and extending clutch life, even in demanding applications like heavy-duty trucks, performance cars, and nitrous-assisted vehicles.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eDesigned to fit seamlessly with 45-tooth clutch plates, this shaft provides increased control and improved power transfer. Its OE damper-less design reduces internal friction and rotational mass, contributing to smoother clutch shifting, quicker response times, and better overall automatic transmission efficiency.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eWhether you’re upgrading for racing, towing, or high-load street use, the 104680-45 delivers the material quality, precise specifications, and performance-focused components required to handle increased torque without compromise.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eCDT35RL4\/80 (3-5-R CLUTCH KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e(6) Alto G3® Clutches\u003c\/li\u003e\n\u003cli\u003e(6) Heat-Treated Steels (varying thicknesses)\u003c\/li\u003e\n\u003cli\u003e(1) Steel Plate\u003c\/li\u003e\n\u003cli\u003e(1) Apply Ring\u003c\/li\u003e\n\u003cli\u003e(1) Backing Plate\u003c\/li\u003e\n\u003cli\u003e(1) Snap Ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCDT35RL4\/80 offers 50% more clutch apply area than stock. G3® friction material is formulated to achieve minimal wear and maximize heat resistance. Our steels are heat-treated and cooled in air, producing a stable and consistent plate that resists warping and ensures smooth clutch operation. This process improves durability and promotes even wear when paired with premium friction materials.\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e\u003cstrong\u003eCDT26L4\/80 (2-6 CLUTCH KIT) \u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e(5) BorgWarner® High-Energy Clutches                                     \u003c\/li\u003e\n\u003cli\u003e(5) Steels                                                    \u003c\/li\u003e\n\u003cli\u003e(1) Snap Ring                                             \u003c\/li\u003e\n\u003cli\u003e(1) Hi-Per Blue® Bonded Piston\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHigh-energy friction material provides the proper friction coefficient, ensuring consistent shift quality and dependable durability. Designed with advanced fiber reinforcement and oil-holding porosity, it delivers stronger holding power, cooler operation, and longer clutch life. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e\u003cstrong\u003eCDT1234L4\/80 (1-2-3-4 CLUTCH KIT)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e(5) BorgWarner® High-Energy Clutches\u003c\/li\u003e\n\u003cli\u003e(5) Steels\u003c\/li\u003e\n\u003cli\u003e(1) Backing Plate\u003c\/li\u003e\n\u003cli\u003e(1) Snap Ring\u003c\/li\u003e\n\u003cli\u003e(1) Spiral Snap Ring\u003c\/li\u003e\n\u003cli\u003e(1) Snap Ring Kit\u003c\/li\u003e\n\u003cli\u003e(1) Hi-Per Blue® Bonded Piston\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHigh-energy friction material provides the proper friction coefficient, ensuring consistent shift quality and dependable durability. Designed with advanced fiber reinforcement and oil-holding porosity, it delivers stronger holding power, cooler operation, and longer clutch life. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e\u003cstrong\u003eCDTLRL4\/80 (LOW-REVERSE CLUTCH KIT)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e(5) BorgWarner® High-Energy Clutches\u003c\/li\u003e\n\u003cli\u003e(5) Steels\u003c\/li\u003e\n\u003cli\u003e(1) Hi-Per Blue® Apply Piston\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHigh-energy friction material provides the proper friction coefficient, ensuring consistent shift quality and dependable durability. Designed with advanced fiber reinforcement and oil-holding porosity, it delivers stronger holding power, cooler operation, and longer clutch life. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e\u003cstrong\u003eCDTVBPKL4\/80-90 (VALVE BODY \u0026amp; PUMP KIT)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e(2) Boost Valve Springs\u003c\/li\u003e\n\u003cli\u003e(2) Clutch Regulator Valve Springs\u003c\/li\u003e\n\u003cli\u003e(1) Center Support Seal Kit\u003c\/li\u003e\n\u003cli\u003e(1) Pressure Regulator Valve Kit\u003c\/li\u003e\n\u003cli\u003e(1) Line Pressure Booster Kit\u003c\/li\u003e\n\u003cli\u003e(1) O-Ringed End Plug Kit\u003c\/li\u003e\n\u003cli\u003e(1) Pump Slide Spring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe valve-body and pump modifications in our 6L80 Level 4 Performance Rebuild Kits are a carefully selected combination of TransGo and Sonnax components. We chose these brands because, through testing and experience, they deliver the best results for pressure control, shift quality, and long-term durability. Each part is designed to work together as a system, ensuring maximum performance and reliability. For this reason, we don’t recommend substituting or adding other components, as doing so can upset the hydraulic balance and reduce the effectiveness of the kit.\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e\u003cstrong\u003eCDTMKL4\/80 (MASTER KIT)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e(1) High-performance overhaul kit engineered utilizing premium materials for racing.\u003c\/li\u003e\n\u003cli\u003e(1) Bonded OE Valve Body Plate\u003c\/li\u003e\n\u003cli\u003e(1) Bushing Kit (includes extension housing bushings)\u003c\/li\u003e\n\u003cli\u003e(1) Pan Gasket\u003c\/li\u003e\n\u003cli\u003e(1) Filter\u003c\/li\u003e\n\u003cli\u003e(1) Oversized Pump Washer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eWe do not include welded hubs in the Kit. At the beginning of R\u0026amp;D on this transmission, we thought this area needed strengthening. However, in all the units that we've rebuilt, we've NEVER seen one broken. Therefore, we deemed it unnecessary. Also, we do not include a billet pump rotor because the factory pump rotor has proven itself reliable (we have never seen one broken), unlike the 4L60E.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eFrequently Asked Questions\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eWhat are the benefits of upgrading to a billet intermediate shaft in a 6L80 transmission?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eUpgrading to a billet intermediate shaft—like the 104680-45—provides enhanced strength, increased oil flow to the clutch pack, and superior heat resistance. These features help reduce the risk of clutch failure and improve transmission reliability in high-performance or heavy-duty applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eHow does a 4140 HTSR billet output carrier improve 6L80 transmission performance?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eA 4140 HTSR billet reinforced output carrier strengthens the spline area and prevents separation under load, which is especially important in vehicles making over 750 RWHP. Its heat-treated steel construction enhances durability, torque control, and resistance to stress fractures in demanding environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eCan I install a 6L80 billet clutch hub without modifying the transmission housing?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eYes, most billet clutch hubs—such as the 104680-45—are designed as direct drop-in components. They are contoured and milled precisely to fit the planetary housing, making them compatible with OEM specifications and easy to install without requiring custom machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eWhat causes clutch failure in 6L80 transmissions, and how can it be prevented?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eClutch failure in 6L80 transmissions is often due to heat buildup, inadequate fluid flow, and low-grade friction materials. Upgrading to high-performance kits with enhanced clutch packs, billet shafts, and improved fluid dynamics helps reduce wear and extend service life.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eIs a 6L80 transmission overhaul kit necessary for high-horsepower builds?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eYes, for vehicles producing high horsepower—especially over 750 RWHP—using a complete 6L80 overhaul kit ensures all critical components (clutches, pistons, shafts, valve bodies) are upgraded for performance and durability. These kits help maintain torque converter efficiency and prevent transmission damage under heavy load.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eRecommended Transmission Tools\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eTransmission holding fixture\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eCalipers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eDial Indicator Set\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eBushing Drivers \u0026amp; Arbor Press for Bushing Installation (Bushings should only be replaced as needed)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eSealing Ring Protector and Sizer\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eVarious Clutch Spring Compressors\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eOutput Carrier\/Shaft Lifting Tool\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e1-2-3-4 \u0026amp; 3-5-R Clutch Housing Installer\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eLarge Snap-Ring Pliers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003ePump Alignment Tool\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eMisc. Transmission Information\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eUpgraded Parts:\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eIf you have an early pump cover (stator) that does not utilize anti-rotational tabs on the sealing rings or an early 1-2-3-4\/3-5-R clutch housing that does not have the matrix stamp, you will need to install a factory-upgraded pump cover and clutch housing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eTransmission Tuning:\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-color=\"var(--purple-10)\"\u003ePlease understand that proper tuning of the TCM and ECM is mandatory. All 6L80\/90’s are torque-based shifted units. The torque signal is calculated through the ECM. Therefore, transmission performance and longevity are directly dependent on the delivered torque signal that’s calculated in the ECM. If this is not done properly, you will experience premature transmission failure. We also do not recommend maxing out pressures or deleting torque management completely because it will cause seal failure and\/or hard part breakage.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cspan class=\"s2\"\u003e\u003cstrong\u003eFlushing Cooler \u0026amp; Lines:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWe cannot stress enough the importance of flushing the transmission cooler(s) and lines, even if they are new.\u003c\/span\u003e\u003cspan class=\"s1\"\u003e We recommend using a Hot Flush Machine Flush Machine or something comparable.\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"Apple-converted-space\"\u003e                                     \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eAuxiliary Cooler:\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eYou need to install a stacked plate auxiliary transmission cooler (not a tube and fin style cooler) rated for 25,000 GVW. The ideal operating temperature for this transmission is 180°or less. These transmissions tend to run very hot, so the cooler will lower the operating temperature and recovery time, which in turn will extend the life of your transmission.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Circle D Transmission","offers":[{"title":"Default Title","offer_id":62754387001503,"sku":"CDTL4PK\/80-P","price":4300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/7571\/6767\/files\/0000257_6l80-performance-transmission-rebuild-kit-cdt-level-4.png?v=1775508971","url":"https:\/\/streetdrivenperformance.net\/products\/6l80-performance-transmission-rebuild-kit-cdt-level-4","provider":"Street Driven Performance","version":"1.0","type":"link"}