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6L80 Performance Transmission 4-5-6 Clutch Kit, Level 2.5

Detailed Instructions Included | FREE UPS Ground to the contiguous United States (lower 48)

Kit is designed with 36 tooth 4-5-6 clutch plates. CDT's Billet 4-5-6 clutch hub and intermediate shaft (CDT part number 104680-36) is not included in this kit. This clutch pack provides 17% more surface area than a stock clutch set up.
Availability: In stock
In stock items ship within 1-2 business days.
Picture for representation purposes only. Actual contents may vary as we continue to develop our products.

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$375.00
SKU: CDT456L2.5/80-P

The 6L80 Level 2.5 clutch kit is the ultimate solution for improving the performance and durability of your 6L80 transmission. Designed for precision and reliability, this performance rebuilt kit includes high-quality components tailored to meet the demands of modern vehicles. The kit is compatible with 36-tooth 4-5-6 clutch plates (sold separately) and provides a significant upgrade over stock clutch pack assemblies, offering 17% more surface area for enhanced performance and longevity.

Features of the 6L80 Level 2.5 Clutch Kit

This transmission rebuild kit includes the following components:

  • 7 Borg Warner® Clutches

  • 6 Lindered Steel Plates

  • 1 Apply Plate

  • 1 Backing Plate

  • 1 Snap Ring

  • 2 Bonded Pistons

The Lindered steel plates undergo a specialized chemical and heat treatment process that hardens the steel, reducing wear and ensuring a longer lifespan. These durable components are engineered to withstand the stresses of high-performance applications, making this kit ideal for vehicles requiring a reliable performance transmission rebuild.

Why Choose the 6L80 Level 2.5 Clutch Kit?

Upgrading to this clutch pack offers numerous benefits for your engine and transmission, including smoother shifts, greater torque capacity, and improved heat resistance. Designed for professional assembly and install, the kit ensures optimal results for heavy-duty, racing, or high-performance vehicles. Whether you’re tackling a rebuild or looking for a superior replacement option, this kit provides the durability and performance needed to handle the demands of modern driving.

Why Choose Circle D Transmission?

At Circle D Transmission, we take pride in providing industry-leading solutions like the 6L80 Level 2.5 clutch kit. Our commitment to quality ensures that every product meets the highest standards for durability, performance, and reliability. Whether you’re upgrading your transmission, replacing worn components, or performing a complete rebuild, our performance rebuilt kits are designed to help you achieve the best possible results. Trust Circle D Transmission for all your high-performance transmission parts and accessories.

Frequently Asked Questions

Is the 36-tooth clutch plate included in this kit?

No, the 36-tooth clutch plates are not included and must be purchased separately.

Can I install this clutch kit myself?

Professional installation is recommended to ensure proper assembly and optimal performance.

What vehicles is this clutch kit compatible with?

This 6L80 Level 2.5 clutch kit is designed for vehicles equipped with a 6L80 transmission.

How does this kit improve transmission performance?

With 17% more clutch apply area, heat-treated steels, and advanced materials, this kit reduces wear and enhances durability under high-stress conditions.

What is the benefit of the Lindered steel plates?

The Lindered steel plates undergo a specialized process to harden the material, providing improved resistance to wear and longer lifespan in demanding applications.

transmission specs worksheet

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.

Transmission Rebuild Kit Warranty

Limited Warranty Statement

Circle D's Transmission Rebuild Kits carry a 1 year, parts-only warranty, exclusively against manufacturer’s defects. The warranty period begins at the date of purchase. There is no warranty under the conditions listed below. This includes, but is not limited to:

  • Improperly Stored
  • Improperly Installed
  • Improperly Tuned (EMC or TCM)
  • Misapplication
  • Altered, either by Owner or Their Technician
  • Torque Converter Failure
  • Inadequate Flushing of Transmission Cooler
  • Improper Fluid Level
  • Water/Engine Coolant in Transmission
  • Excessive Power
  • Accident
  • Neglect

Circle D Transmission will not pay for any fluids replaced in the event of a rebuild kit failure.

Under no circumstances shall there be any labor warranty or other warranty coverage on Circle D Transmission Kits beyond the replacement of individual rebuild kit components. We will not provide you with any cash refund except as may be required by law. Consequential and incidental damages are not recoverable under this warranty and are expressly excluded.

There is no warranty on broken parts such as, but not limited to, twisted splines, broken shafts, or broken planetaries.

Warranty issues will be considered on an individual basis.