{"product_id":"6l90-performance-transmission-rebuild-kit-level-4","title":"6L90 Performance Transmission Rebuild Kit - Level 4","description":"\u003cdiv class=\"product-name\"\u003e\n\u003cdiv class=\"product-name\"\u003e\n\u003cdiv class=\"product-name\"\u003e\n\u003cdiv class=\"product-name\"\u003e\n\u003ch1\u003e6L90 Performance Transmission Rebuild Kit - Level 4\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"short-description\"\u003eRated up to 1100 RWHP, HP ratings are contingent on numerous factors, such as tune, vehicle weight, power adder, use, etc. | Detailed Instructions Included | FREE UPS Ground to the contiguous United States (lower 48) | This kit carries a required refundable planetary core charge.\u003cbr\u003e\u003cbr\u003eKit is designed with 45-tooth 4-5-6 clutch plates. CDT's Billet 4-5-6 clutch hub and intermediate shaft (CDT part number 104690-45) is included in this kit. The 4-5-6 clutch pack provides 45% more surface area than a stock clutch set up. The 3-5-R clutch pack offers 40% more clutch area than stock.\u003c\/div\u003e\n\u003cdiv class=\"short-description\"\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\u003e\u003cspan\u003e\u003cstrong\u003e6L90 CDT-BROC (4140 HTSR Billet Reinforced Output Carrier)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eThis part is designed for vehicles producing over 750 RWHP, Nitrous or Heavy Vehicles (including trucks, SUV's and CTS-V's).\u003cbr\u003eIt is a drop in part for easy installation.\u003cbr\u003e4140 billet steel drive plate to strengthen the spline area.\u003cbr\u003eThe drive plate is milled and contoured to the planetary housing to eliminate any possible separation under a load.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eCDT456L4\/90 (4-5-6 CLUTCH KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e(8) Alto G3® Clutches\u003cbr\u003e(9) Heat-Treated Steels (varying thicknesses)\u003cbr\u003e(1)  Stepped Apply Plate\u003cbr\u003e(1)  Wide Backing Plate\u003cbr\u003e(1)  Snap Ring\u003cbr\u003e(2)  Hi-Per Blue® Bonded Pistons\u003c\/p\u003e\n\u003cp\u003eCDT456L4\/90 offers 45% 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\u003cstrong\u003e\u003cspan\u003e104690-45 (BILLET INTERMEDIATE SHAFT \u0026amp; 4-5-6 CLUTCH HUB) \u003c\/span\u003e                                                                                                   \u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOne-piece 300M steel forging is heat-treated and shot-peened for maximum durability. This shaft doubles oil flow to the clutch pack for improved resistance to heat and longer clutch life. The hub is designed for use with 45-tooth clutch plates. This shaft is designed for use without OE dampner.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eCDT35RL4\/90 (3-5-R CLUTCH KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e(7) Alto G3® Clutches\u003cbr\u003e(7) Heat-Treated Steels (varying thicknesses)\u003cbr\u003e(1) Steel Plate\u003cbr\u003e(1) Apply Ring\u003cbr\u003e(1) Backing Plate\u003cbr\u003e(1) Snap Ring\u003c\/p\u003e\n\u003cp\u003eCDT35RL4\/90 offers 40% 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\u003eCDT26L4\/90 (2-6 CLUTCH KIT) \u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e(6) BorgWarner® High-Energy Clutches                                       \u003cbr\u003e(6) Steels                                                 \u003cbr\u003e(1) Snap Ring                                              \u003cbr\u003e(1) Hi-Per Blue® Bonded Piston\u003c\/p\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\u003eCDT1234L4\/90 (1-2-3-4 CLUTCH KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e(6) BorgWarner® High-Energy Clutches\u003cbr\u003e(6) Steels\u003cbr\u003e(1) Backing Plate\u003cbr\u003e(1) Snap Ring\u003cbr\u003e(1) Spiral Snap Ring\u003cbr\u003e(1) Snap Ring Kit\u003cbr\u003e(1) Hi-Per Blue® Bonded Piston\u003c\/p\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\u003eCDTLRL4\/90 (LOW-REVERSE CLUTCH KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e(6) BorgWarner® High-Energy Clutches\u003cbr\u003e(6) Steels\u003cbr\u003e(1) Hi-Per Blue® Apply Piston\u003c\/p\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\u003eCDTVBPKL4\/80-90 (VALVE BODY \u0026amp; PUMP KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e(2) Boost Valve Springs\u003cbr\u003e(2) Clutch Regulator Valve Springs\u003cbr\u003e(1) Center Support Seal Kit\u003cbr\u003e(1) Pressure Regulator Valve Kit\u003cbr\u003e(1) Line Pressure Booster Kit\u003cbr\u003e(1) O-Ringed End Plug Kit\u003cbr\u003e(1) Pump Slide Spring\u003c\/p\u003e\n\u003cp\u003eThe valve-body and pump modifications in our 6L90 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\u003cstrong\u003e\u003cspan\u003eCDTMKL4\/90 (MASTER KIT)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e(1) High-performance overhaul kit engineered utilizing premium materials for racing.\u003cbr\u003e(1) Bonded OE Valve Body Plate\u003cbr\u003e(1) Bushing Kit (includes extension housing bushings)\u003cbr\u003e(1) Pan Gasket\u003cbr\u003e(1) Filter\u003cbr\u003e(1) Oversized Pump Washer\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\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\u003cp\u003e\u003cspan\u003ePLEASE NOTE: GM has a transmission that has the same outside dimensions as a 6L90 but uses one less clutch in all the clutch housings compared to a true 6L90. We call this transmission a 6L90LCC (less clutch capacity). Please refer to \"Stock Clutch Capacity Chart\" and \"Length of Main Case Chart\" on the \"Transmission Specs\" tab below to determine if you have a 6L90 or 6L90LCC. When ordering this part, please indicate in the Notes textbox above that you have a 6L90LCC. If you are unable to determine if you have a 6L90 or 6L90LCC, we will determine which transmission you have from the VIN.\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":62754401910943,"sku":"CDTL4PK\/90-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\/6l90-performance-transmission-rebuild-kit-level-4","provider":"Street Driven Performance","version":"1.0","type":"link"}