6L80 CDT-BROC: Reinforced Output Carrier for High-Powered Applications
6L80 CDT-BROC (4140 HTSR Billet Reinforced Output Carrier) | NO core required for output carrier
The 6L80 CDT-BROC is a performance-engineered output carrier specifically built for 6L80 transmissions in high-powered applications. Designed for vehicles producing over 750 RWHP—including heavy-duty trucks, SUVs, CTS-Vs, and nitrous-assisted builds—this component delivers exceptional strength, reliability, and longevity under extreme load conditions.
Machined from 4140 HTSR (Heat Treated Stress Relieved) billet steel, the carrier offers increased hardness and high strength, which minimizes distortion and improves wear resistance during high-torque operations. This material choice significantly reduces the risk of clutch failure, stress fractures, and spline stripping, all common concerns when upgrading six-speed automatic transmissions for high-horsepower use.
The billet steel drive plate has been precision-milled and contoured to fit seamlessly with the planetary housing, virtually eliminating the possibility of separation under dynamic loads. As a drop-in part, installation is quick and efficient, with no need for a core return. For builders and technicians seeking OEM+ quality, improved power handling, and upgraded transmission components, the CDT-BROC is a trusted choice—engineered to meet demanding performance specifications while offering long-term reliability.
CDT456L4/80 (4-5-6 CLUTCH KIT)
- (7) Alto G3® Clutches
- (9) Heat-Treated Steels (varying thicknesses)
- (1) Stepped Apply Plate
- (1) Wide Backing Plate
- (1) Snap Ring
- (2) Hi-Per Blue® Bonded Pistons
CDT456L4/80 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.
104680-45: Billet Intermediate Shaft & 4-5-6 Clutch Hub for 6L80 Transmission Performance
104680-45 (One-Piece Billet Intermediate Shaft & 4-5-6 Clutch Hub)
The 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.
Engineered 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.
Designed 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.
Whether 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.
CDT35RL4/80 (3-5-R CLUTCH KIT)
- (6) Alto G3® Clutches
- (6) Heat-Treated Steels (varying thicknesses)
- (1) Steel Plate
- (1) Apply Ring
- (1) Backing Plate
- (1) Snap Ring
CDT35RL4/80 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.
CDT26L4/80 (2-6 CLUTCH KIT)
- (5) BorgWarner® High-Energy Clutches
- (5) Steels
- (1) Snap Ring
- (1) Hi-Per Blue® Bonded Piston
High-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.
CDT1234L4/80 (1-2-3-4 CLUTCH KIT)
- (5) BorgWarner® 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
High-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.
CDTLRL4/80 (LOW-REVERSE CLUTCH KIT)
- (5) BorgWarner® High-Energy Clutches
- (5) Steels
- (1) Hi-Per Blue® Apply Piston
High-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.
CDTVBPKL4/80-90 (VALVE BODY & PUMP KIT)
- (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
The valve-body and pump modifications in our 6L80 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.
CDTMKL4/80 (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 the Kit. At the beginning of R&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.
Frequently Asked Questions
What are the benefits of upgrading to a billet intermediate shaft in a 6L80 transmission?
Upgrading to a billet intermediate shaft—like the 104680-45—provides enhanced strength, increased oil flow to the clutch pack, and superior heat resistance. These features help reduce the risk of clutch failure and improve transmission reliability in high-performance or heavy-duty applications.
How does a 4140 HTSR billet output carrier improve 6L80 transmission performance?
A 4140 HTSR billet reinforced output carrier strengthens the spline area and prevents separation under load, which is especially important in vehicles making over 750 RWHP. Its heat-treated steel construction enhances durability, torque control, and resistance to stress fractures in demanding environments.
Can I install a 6L80 billet clutch hub without modifying the transmission housing?
Yes, most billet clutch hubs—such as the 104680-45—are designed as direct drop-in components. They are contoured and milled precisely to fit the planetary housing, making them compatible with OEM specifications and easy to install without requiring custom machining.
What causes clutch failure in 6L80 transmissions, and how can it be prevented?
Clutch 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.
Is a 6L80 transmission overhaul kit necessary for high-horsepower builds?
Yes, for vehicles producing high horsepower—especially over 750 RWHP—using a complete 6L80 overhaul kit ensures all critical components (clutches, pistons, shafts, valve bodies) are upgraded for performance and durability. These kits help maintain torque converter efficiency and prevent transmission damage under heavy load.
