{"product_id":"6l80-performance-transmission-rebuild-kit-level-3","title":"6L80 Performance Transmission Rebuild Kit - Level 3","description":"\u003cdiv class=\"product-name\"\u003e\n\u003cdiv class=\"product-name\"\u003e\n\u003ch1\u003e6L80 Performance Transmission Rebuild Kit - Level 3\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"short-description\"\u003eRated up to 750 RWHP. HP ratings are contingent on numerous factors, such as tune, vehicle weight, power adder, use, etc.\u003cbr\u003e\u003cbr\u003eDetailed Instructions Included | FREE UPS Ground to the contiguous United States (lower 48)\u003cbr\u003e\u003cbr\u003eThe 6L80 Transmission Rebuild Kit is designed with 45-tooth 4-5-6 clutch plates. Circle D Transmission's billet 4-5-6 clutch hub and intermediate shaft (CDT part number 104680-45) are included in this kit. The 4-5-6 clutch pack provides 50% more surface area than a stock clutch set-up, and the 3-5-R clutch pack offers 50% more clutch area than stock.\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\u003cdiv class=\"attributes\"\u003e\n\u003cdiv class=\"attribute-description\"\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eCDT456L3\/80 (4-5-6 CLUTCH KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli class=\"p4\"\u003e(7) Alto G3® Clutches\u003c\/li\u003e\n\u003cli class=\"p4\"\u003e(9) Heat-Treated Steels (varying thicknesses)\u003c\/li\u003e\n\u003cli class=\"p4\"\u003e(1) Stepped Apply Plate\u003c\/li\u003e\n\u003cli class=\"p4\"\u003e(1) Wide Backing Plate\u003c\/li\u003e\n\u003cli class=\"p4\"\u003e(1) Snap Ring\u003c\/li\u003e\n\u003cli class=\"p4\"\u003e(2) Hi-Per Blue® Bonded Pistons\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe CDT456L3\/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\u003e\u003cspan\u003e\u003cstrong\u003e104680-45 (1-PIECE BILLET INTERMEDIATE SHAFT \u0026amp; 4-5-6 CLUTCH HUB)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\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\u003eCDT35RL3\/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\u003eThe CDT35RL3\/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\u003cstrong\u003e\u003cspan\u003eCDT26L3\/80 (2-6 CLUTCH KIT) \u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan\u003eCDT1234L3\/80 (1-2-3-4 CLUTCH KIT)\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan\u003eCDTLRL3\/80 (LOW-REVERSE CLUTCH KIT)\u003c\/span\u003e\u003c\/strong\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 performan\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eCDTVBPKL3\/80-90 (VALVE BODY \u0026amp; PUMP KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2 Boost Valve Springs\u003c\/li\u003e\n\u003cli\u003e2 Clutch Regulator Valve Springs\u003c\/li\u003e\n\u003cli\u003e1 Center Support Seal Kit\u003c\/li\u003e\n\u003cli\u003e1 Pressure Regulator Valve Kit\u003c\/li\u003e\n\u003cli\u003e1 Line Pressure Booster Kit\u003c\/li\u003e\n\u003cli\u003e1 O-Ringed End Plug Kit\u003c\/li\u003e\n\u003cli\u003e1 Pump Slide Spring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe valve-body and pump modifications in our 6L80 Level 3 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\u003cstrong\u003e\u003cspan\u003eCDTMKL3\/80 (MASTER KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 High-Performance overhaul kit engineered utilizing premium materials for racing\u003c\/li\u003e\n\u003cli\u003e1 Bonded OE Valve Body Plate \u003c\/li\u003e\n\u003cli\u003e1 Bushing Kit (includes extension housing bushings)\u003c\/li\u003e\n\u003cli\u003e1 Pan Gasket\u003c\/li\u003e\n\u003cli\u003e1 Filter\u003c\/li\u003e\n\u003cli\u003e1 Oversized Pump Washer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e \u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan data-color=\"var(--purple-10)\"\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, so we deemed it unnecessary. Also, we do not include a billet pump rotor because, unlike the 4L60E, the factory pump rotor has proven itself reliable (we have never seen one broken). \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-color=\"var(--purple-10)\"\u003eWe recommend the Billet Reinforced Output Carrier for vehicles producing over 750 RWHP, Nitrous, or Heavy Vehicles (including trucks, SUVs, and CTS-Vs). Note: We have seen the stock output carrier (planetary) break in vehicles with less than 750 RWHP. We do not warranty the stock output carrier (planetary). We highly recommend that you purchase the billet-reinforced output carrier. We offer a \u003c\/span\u003e\u003ca href=\"https:\/\/circledtrans.com\/6l80-level-4-performance-rebuild-kit\" rel=\"noopener noreferrer\"\u003e\u003cspan data-color=\"var(--purple-10)\"\u003e6L80 Level 4 Kit\u003c\/span\u003e\u003c\/a\u003e\u003cspan data-color=\"var(--purple-10)\"\u003e that includes this part.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e \u003c\/h2\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\u003eIs this kit suitable for daily driving as well as performance builds?\u003c\/h3\u003e\n\u003cp\u003eAbsolutely. The kit provides excellent durability and performance upgrades while maintaining drivability. It is a solid choice for both street use and track\/towing builds up to the rated power.\u003c\/p\u003e\n\u003ch3\u003eDo I need any special tools to install this kit?\u003c\/h3\u003e\n\u003cp data-start=\"2675\" data-end=\"3002\"\u003eYes. Installation requires professional transmission tools such as clutch spring compressors, seal installers, and precision measuring equipment. For best results, installation should be performed by a qualified transmission builder familiar with GM 6L80 units.\u003c\/p\u003e\n\u003ch3\u003eWhat tuning requirements should I be aware of?\u003c\/h3\u003e\n\u003cp data-start=\"1324\" data-end=\"1597\"\u003eProper ECM\/TCM tuning is\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"1413\" data-end=\"1426\"\u003emandatory\u003c\/strong\u003e. The 6L80 is a torque-based shift unit, so accurate torque signal calibration is critical. Incorrect tuning can cause premature clutch failure and void warranty coverage.\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)\"\u003eDo I need to install a transmission cooler?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eYes. We strongly recommend a\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"1694\" data-end=\"1728\"\u003estacked-plate auxiliary cooler\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003erated at 25,000 GVW. Operating temps should be kept at or below ~180°F for best results.\u003c\/p\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":62754386018463,"sku":"CDTL3PK\/80-P","price":3225.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/7571\/6767\/files\/0000256_6l80-performance-transmission-rebuild-kit-level-3.png?v=1775508847","url":"https:\/\/streetdrivenperformance.net\/products\/6l80-performance-transmission-rebuild-kit-level-3","provider":"Street Driven Performance","version":"1.0","type":"link"}