Upgrade your 6L80 transmission with Circle D Transmission’s CDT Level 4 Performance 6L80 Parts & Kits, designed for serious builders demanding more power, control, and durability. Our Level 4 kit is engineered for heavy duty applications, ideal for vehicles pushing high horsepower and torque under extreme driving conditions. Whether you’re racing, towing, or simply want to enhance performance, this package gives your transmission the reinforcements it needs.
Included in the kit is a high-quality piston kit, precision-machined for maximum reliability and heat resistance. Combined with our advanced clutch pack and friction materials, this setup ensures firmer shifts and extended service life. The overhaul kit comes complete with all essential seals, gaskets, and components to properly refresh your 6L80 transmission, making it the ideal choice for a full rebuild or major upgrade.
Circle D’s performance 6L80 parts are engineered for maximum boost capacity, allowing your transmission to handle increased power levels without compromising drivability or safety. Whether you’re building for street performance or competitive motorsports, our kits provide the rugged enhancements needed for lasting results. Trust Circle D for precision-built, proven components that raise the bar for performance 6L80 builds.
FREE UPS Ground to the contiguous United States (lower 48) | NO core required for output carrier
Rated 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.
Designed 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.
Built 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.
Includes all 5 Clutch Kits | Detailed Instructions Included | FREE UPS Ground to the contiguous United States (lower 48)
Upgrade your 6L80 transmission with this premium clutch kit, engineered for superior performance and long-lasting transmission durability. This heavy-duty kit features precision-machined 45-tooth 4-5-6 friction clutch plates that deliver 50% more surface area than the standard OEM clutch setup. The increased surface area results in improved transmission performance, enhanced torque handling, and better heat management under demanding driving conditions.
To utilize this upgraded 6L80 transmission clutch pack, you must use CDT’s Billet 4-5-6 Clutch Hub and Intermediate Shaft (CDT part number 104680-45-P), which are sold separately. These heavy-duty transmission parts are essential for proper fitment and maximizing the benefits of this performance upgrade. Please note: the billet clutch hub and intermediate shaft are not included in this kit.
Also included is the enhanced 3-5-R clutch pack, which provides 50% more clutch area than stock GM components, further boosting overall transmission durability and strength. Whether you’re building for towing, off-roading, or high-horsepower street use, this 6L80 transmission clutch kit offers the quality and reliability you need.
Perfect for GM vehicles equipped with the 6L80 transmission, this kit is designed for enthusiasts and builders who demand top-tier performance from their transmission parts. We stand behind our products and offer fast shipping so you can shop with confidence and keep your project moving forward.
Detailed Instructions Included |FREE UPS Ground to the contiguous United States (lower 48)
This kit is engineered for serious performance and durability, featuring precision-machined 45-tooth 4-5-6 clutch plates designed specifically for the 6L80 transmission. At the heart of this upgrade is CDT’s Billet 4-5-6 Clutch Hub and Intermediate Shaft (CDT part number 104680-45), which is included in the kit. These billet components are built to withstand high torque applications and enhance overall transmission reliability, even under extreme driving conditions.
The upgraded clutch pack delivers 50% more surface area than the factory 6L80 clutch setup, dramatically improving torque capacity, shift quality, and thermal efficiency. Whether you’re building a high-performance street machine or a heavy-duty tow vehicle, this 6L80 transmission billet upgrade ensures long-lasting strength and consistent performance. Shop now to upgrade your drivetrain with premium billet transmission parts that meet the demands of today’s high-horsepower builds.
Detailed Instructions Included | FREE UPS Ground to the contiguous United States (lower 48)
The required 45-tooth clutch plates are not included with this product and must be purchased separately. This billet shaft is designed specifically to work with 45-tooth clutch plates, ensuring optimal performance and durability in high-powered applications. For best results, pair this clutch kit with high-quality clutch components that match your vehicle’s needs.
Detailed Instructions Included | FREE UPS Ground to the contiguous United States (lower 48)
To unlock the full potential of your 6L80 transmission clutch kit, CDT’s Billet 4-5-6 clutch hub and intermediate shaft (part number 104680-45-P) is a required upgrade. This billet steel component is engineered to deliver superior performance under extreme torque and temperature conditions, making it an essential pairing for any high-performance clutch pack.
Designed to withstand high stress and deliver exceptional high temperature durability, this hub supports upgraded friction components manufactured for strength and reliability. When used in conjunction with a properly built piston kit and friction plate set, it ensures optimal transmission performance and reduces the risk of clutch failure common in stock clutches and single sided clutch systems.
By improving fluid dynamics and reinforcing the clutch engagement process, the 104680-45-P helps eliminate common issues like clutch plate failure, heat soak, and warping—especially in heavy-duty or high-horsepower applications. If you’re aiming for long-lasting performance and reliability, this billet hub is not just an upgrade—it’s a necessity.
Detailed Instructions Included | FREE UPS Ground to the contiguous United States (lower 48)
This heavy-duty 3-5-R clutch pack is engineered to deliver 50% more clutch surface area than the stock setup, significantly enhancing clutch shifting precision and overall transmission performance. Designed to handle increased torque and power output, this upgrade works seamlessly with other high-performance components such as a billet shaft, upgraded piston kit, and a high-stall torque converter.
Whether you’re modifying your 6L80 for racing or towing applications, this clutch pack is built to withstand the demands of high stress and heat, delivering smoother shifts, longer durability, and superior power transfer. When paired with optimized 6L80 gear ratios, this upgrade helps ensure quicker response times and more efficient use of available power.
Crafted for those who demand top-tier quality, this is the go-to clutch solution for maximizing the capabilities of your 6L80 transmission.
FREE UPS Ground to the contiguous United States (lower 48) | NO core required
Engineered for extreme applications, this drop-in component is ideal for nitrous-assisted or heavy vehicles producing over 750 rear-wheel horsepower. It’s manufactured from 4140 HTSR steel, a heat treated, hot rolled alloy known for its exceptional hardness and high strength. The material offers superior mechanical properties, making it well-suited for high-stress automotive environments, particularly in high-horsepower trucks, SUVs, and performance platforms like the CTS-V.
The 4140 HTSR material ensures outstanding wear resistance, especially in driveline systems exposed to intense heat and mechanical stress. Its ability to resist stress fractures and maintain structural integrity under heavy loads makes it ideal for demanding applications where failure is not an option. The high strength and hardness of this steel enhance component longevity and operational reliability in both racing and off-road use cases.
Engineered to meet or exceed OEM specifications, this part is often used in applications involving custom gears, performance bolts, and torque-transmitting assemblies where both resistance to deformation and dimensional stability are critical. With unmatched ability to perform in extreme conditions, it’s the trusted solution for builders and fabricators seeking top-tier metallurgy and precision.
