6L80 Performance Transmission Rebuild Kit - Level 2 Circle D Transmission

CDT456L2/80 (4-5-6 CLUTCH KIT)

• 7 Borg Warner® Clutches
• 6 Lindered Steel Plates
• 1 Apply Plate
• 1 Backing Plate
• 1 Snap Ring
• 2 Bonded Pistons

CDT456L2/80 offers 17% more clutch apply area than stock. This clutch kit works with the OE intermediate 4-5-6 clutch hub.  Lindered is a chemical and heat treatment process that hardens the steel, which results in less wear.

CDT35RL2/80 (3-5-R CLUTCH KIT)

• 5 Borg Warner® High Energy Clutches
• 6 Kolene® Steels (varying thickness)
• 1 Backing Plate
• 1 Snap Ring

CDT35RL2/80 offers 25% more clutch apply area than stock. High Energy material maintains consistent frictional behavior and tolerates extreme thermal stress applications. Kolene steels provide a surface treatment that enhances wear and fatigue resistance.

CDT26L2/80 (2-6 CLUTCH KIT)

• 5 Borg Warner® Clutches
• 5 Steels
• 1 Snap Ring
• 1 Hi-Per Blue® Bonded Piston

Hi-Per Blue® Pistons are manufactured with upgraded High-Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.

CDT1234L2/80 (1-2-3-4 CLUTCH KIT)

• 5 High Energy® Clutches
• 5 Steels
• 1 Snap Ring
• 1 Spiral Snap Ring
• 1 Snap Ring Kit
• 1 Hi-Per Blue® Bonded Piston

High Energy material maintains consistent frictional behavior and tolerates extreme thermal stress applications. Hi-Per Blue® Pistons are manufactured with upgraded High-Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.

CDTLRL2/80 (LOW-REVERSE CLUTCH KIT)

• 5 High Energy® Clutches
• 5 Steels
• 1 Hi-Per Blue® Bonded Piston

High Energy material maintains consistent frictional behavior and tolerates extreme thermal stress applications. Hi-Per Blue® Pistons are manufactured with upgraded High-Performance Blue AEM material for superior thermal and chemical resistance with better fit and performance.

CDTVBPKL2/80-90 (VALVE BODY & PUMP KIT)

• 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

CDTMKL2/80 (MASTER KIT)

• 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

We do not include welded hubs in this rebuild kit. At the beginning of R&D on this transmission, we thought this area needed strengthening. However, we've never seen one broken in all the units we've rebuilt. 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.

Recommended Transmission Tools

• Transmission holding fixture
• Calipers
• Dial Indicator Set
• Bushing Drivers & Arbor Press for Bushing Installation (Bushings should only be replaced as needed)
• Sealing Ring Protector and Sizer
• Various Clutch Spring Compressors
• Output Carrier/Shaft Lifting Tool
• 1-2-3-4 & 3-5-R Clutch Housing Installer
• Large Snap-Ring Pliers
• Pump Alignment Tool

Misc. Transmission Information

Upgraded Parts: If 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.

Transmission Tuning: Please 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.

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 Flush Machine or something comparable.                                      

Auxiliary Cooler: You 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.