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Monday thru Friday 7:00 am to 5:00 pm CST
Texas - Central Time
The CDT Level 4 built 6L80 transmission rebuild offers a complete solution for enthusiasts seeking maximum power, horsepower, and reliability in their vehicles. This comprehensive bench job includes expert labor and all premium components such as a billet pump rotor, billet converter, precision-engineered pressure plates, and a fully upgraded valve body—all designed to surpass the limitations of stock clutches. Our billet upgrades ensure increased capacity and durability, making this rebuild ideal for heavy duty applications and high-performance builds.
The 6L80 transmission is carefully inspected and rebuilt with precision, focusing on enhancing torque multiplication and overall transmission efficiency. Custom tuning services are also available to perfectly match your engine setup and driving demands.
To proceed, you will need to ship your transmission to us for the rebuild. If you prefer, contact us to inquire about availability for a transmission core to supply for your project.
$6,520*
This part is specifically designed for vehicles producing over 750 RWHP, nitrous applications, or heavy duty vehicles such as trucks, SUVs, and CTS-Vs. Made from durable 4140 billet steel, the drive plate strengthens the spline area to handle extreme power and torque demands. The drive plate is precisely milled and contoured to fit the planetary housing, eliminating any possibility of separation under high load conditions. This billet upgrade enhances the overall reliability and capacity of the 6L80 transmission, making it an essential component for those seeking a robust custom solution that withstands the stresses of increased horsepower and aggressive engine setups.
7 G3® Clutches
8 Lindered Steels (varying thicknesses)
1 Stepped Apply Plate
1 Wide Backing Plate
1 Snap Ring
2 Hi-Per Blue® Bonded Pistons
The CDT456L3/80 built 6L80 upgrade offers 50% more clutch apply area than stock, significantly increasing holding capacity and power handling. G3® friction material is specially formulated to achieve minimal wear and maximize heat resistance, enhancing overall reliability. Lindured is a chemical and heat treatment process that hardens the steel components, resulting in less wear and longer service life. Hi‑Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material for superior thermal and chemical resistance, providing a better fit and optimized performance. Together, these billet upgrades and premium components create a custom 6L80 transmission solution designed to maximize horsepower, durability, and torque multiplication for demanding heavy duty applications.
This one-piece 300M steel forging shaft is heat treated and shot-peened to deliver maximum durability and strength, making it an essential billet upgrade for the built 6L80 transmission. Engineered to double oil flow to the clutch pack, this design significantly improves resistance to heat, resulting in longer clutch life and enhanced reliability under extreme conditions. The hub is specifically crafted to work with Powerglide-style, 45-tooth friction plates, optimizing pressure plates engagement and torque multiplication for superior power transfer. Designed for use without the OE dampener, this shaft integrates seamlessly with the valve body, billet pump rotor, and billet converter to create a robust, custom solution ideal for heavy duty vehicles and high-horsepower applications, increasing overall transmission capacity and performance in the competitive transmission industry.
6 G3® Keyhole Clutches
6 Kolene® Steels (varying thicknesses)
1 Steel Plate
1 Apply Ring
1 Backing Plate
1 Snap Ring
CDT35RL3/80 offers 50% more clutch apply area than stock. G3® friction material is formulated to achieve minimal wear & maximize heat resistance. Keyhole Clutch design allows a significant amount of ATF to escape out of the O/D and I/D channels to improve clutch engagement. The pooling of ATF in the slot and hole separates the friction and steels when the clutch is disengaged reducing parasitic drag and heat build-up. Kolene® Steels provide a surface treatment the enhances wear & fatigue resistance.
5 Red Eagle® Externally Splined Clutches
5 Red Eagle® Internally Splined Clutches
1 Externally Splined Steel Plate
1 Snap Ring
1 Hi-Per Blue® Bonded Piston
Red Eagle® Clutches are designed to limit the amount of slip, providing a shorter apply time and generating less heat for improved durability and performance. Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material, offering superior thermal and chemical resistance with a better fit and enhanced performance. At Circle D Transmission, we prioritize quality by using new gaskets and premium components to replace worn parts and transform your transmission’s reliability and power delivery. Especially in turbo applications and high-performance cars, these upgrades help optimize stall characteristics and overall transmission function—all at a competitive price that ensures you get maximum value and longevity.
5 Alto High Energy® Clutches
5 Steels
1 Backing Plate
1 Snap Ring
1 Spiral Snap Ring
1 Snap Ring Kit
1 Hi-Per Blue® Bonded Piston
Hi-Per Blue® Pistons are manufactured with upgraded High Performance Blue AEM material, providing superior thermal and chemical resistance along with a better fit for enhanced performance. At Circle D Transmission, we use these pistons to ensure quality and durability, especially in turbocharged vehicles and high-performance cars where heat and stress are greater. When it’s time to replace worn components, these pistons help transform your transmission’s responsiveness and reliability, contributing to improved stall behavior—all offered at a competitive price.
5 Alto High Energy® Clutches
5 Steels
1 Hi-Per Blue® Apply Piston
Hi-Per Blue® Pistons are crafted with upgraded High Performance Blue AEM material, delivering superior thermal and chemical resistance for enhanced durability and a better fit that boosts overall performance. At Circle D Transmission, these pistons are a key component in ensuring quality rebuilds that can withstand the demands of turbocharged engines and high-performance cars. When you need to replace worn parts, upgrading to Hi-Per Blue® Pistons can transform your transmission’s reliability and improve stall characteristics—all while maintaining competitive price and exceptional value.
2 Boost Valve Springs
2 Clutch Regulator Valve Springs
1 Center Support Seal Kit
1 Pressure Regulator Valve Kit
1 Line Pressure Booster Kit
1 O-Ringed End Plug Kit
1 Pump Slide Spring
1 High Performance overhaul kit engineered utilizing premium materials for racing.
1 Bonded OE Valve Body Plate
1 Bushing Kit (includes extension housing bushings)
1 Pan Gasket
1 Filter
1 Oversized Pump Washer
*$6,520 does not include any Hard Part damage, Torque Converter or TCM/ECM tuning. After an internal inspection of your transmission we will notify you of any hard part damage that will carry an additional cost. Also, if your vehicle is pre-2010 we may need to install a new upgraded pump stator (cover) and 1-2-3-4/3-5-R drum.
Warranty varies according to application. Please refer to Warranty Info page on our website.
Shipping If you need assistance shipping your transmission, we can arrange Domestic Shipping (averages $250 - $500 each way) for your transmission. Please complete the Shipping Questionnaire on our website (listed under the Contact Us tab) if your would like us to arrange shipping.
Transmission Tuning We do not supply a TCM or ECM tune. Please understand that proper tuning of the TCM and ECM are mandatory. All 6L80’s are torque base shifted units. The torque signal is calculated thru the ECM. Therefore, transmission performance & 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. Please contact us for tuner recommendations. A review of final tune and final log files is included. Once your final tune and log reviews meet our requirements we will document this in our records for warranty purposes. Please only drive the vehicle for tuning purposes until this process is completed.
Flushing Cooler & Lines We cannot stress enough the importance of flushing the transmission cooler(s) and lines, even if they are new. We recommend using a Hot Flush Machine or something comparable.
Auxiliary Cooler You need to install a stacked plate auxiliary transmission cooler (not a tube & fin style cooler) rated for 25,000 GVW. The ideal operating temperature for this transmission is 180°or less. These transmissions have a tendency to run very hot – the cooler will lower operating temperature and recovery time which in turn will extend the life of your transmission.
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The Crew at CDT
The CDT Level 4 rebuild includes a full suite of premium billet upgrades such as a billet pump rotor, billet converter, precision-engineered pressure plates, and a fully upgraded valve body. These components work together to increase capacity, improve torque multiplication, and deliver superior power and reliability well beyond stock clutches. This complete solution is ideal for heavy duty vehicles and builds rated up to 1000 RWHP.
The 4140 billet steel drive plate is milled and contoured to fit the planetary housing perfectly, eliminating the risk of separation under extreme load. Designed for vehicles with over 750 RWHP, nitrous setups, or heavy duty applications like trucks and CTS-Vs, this billet upgrade strengthens the spline area to handle increased horsepower and aggressive engine torque, enhancing overall transmission capacity and durability.
The CDT456L3/80 clutch kit offers 50% more clutch apply area than stock, significantly boosting holding capacity and power handling. It includes advanced G3® friction material formulated for minimal wear and maximum heat resistance. The Hi-Per Blue® Pistons, made from upgraded Blue AEM material, provide superior thermal and chemical resistance for a better fit and optimized performance, delivering enhanced torque multiplication and long-term reliability in demanding heavy duty conditions.
Proper custom tuning of the TCM and ECM is crucial because the 6L80 is a torque-based transmission, relying on accurate torque signals calculated by the ECM for shift quality and longevity. Without correct tuning, premature transmission wear, seal failure, or hard part breakage can occur. CDT offers a final tune and log file review to ensure your transmission performs reliably and qualifies for warranty coverage.
To maintain ideal operating temperatures (around 180°F or less), CDT recommends installing a stacked plate auxiliary transmission cooler rated for at least 25,000 GVW. This cooler design effectively lowers transmission heat and recovery time, extending transmission life. Additionally, flushing transmission coolers and lines—even new ones—with a Hot Flush Machine or equivalent is essential to prevent contaminants and ensure optimal fluid flow for high-performance 6L80 builds.