6L80 Level 2.5 Performance Transmission Rebuild Kit

The Circle D Transmission 6L80 Performance Transmission Rebuild Kit (Level 2.5) is engineered to deliver unmatched performance and reliability for demanding trucks and cars. This comprehensive kit targets key areas of the 6L80 transmission, enhancing its capacity and durability for heavy-duty use. It features specific clutch kits, including the 4-5-6 clutch pack with 17% more surface area and the 3-5-R clutch pack with 25% more surface area than stock configurations. The kit incorporates a billet 4-5-6 clutch hub and intermediate shaft forged from 300M steel, which is heat-treated and shot-peened for maximum durability. This component also doubles oil flow to the clutch pack, improving heat resistance and extending clutch life. This transmission upgrade is rated for up to 700 RWHP, though actual performance may vary based on factors like tune, vehicle weight, and power adders. The kit includes printed instructions for most components, with separate instructions available for Sonnax items. Detailed specifications and quality-tested components ensure optimal functionality for those looking to upgrade or replace their current transmission setup. Important considerations for this kit include mandatory transmission tuning of the TCM and ECM, as improper tuning can lead to premature failure. It is also crucial to properly flush the transmission cooler and lines, and the installation of an auxiliary transmission cooler rated for 25,000 GVW is recommended to maintain optimal operating temperatures below 180°F. Circle D Transmission offers a 1-year, parts-only warranty exclusively against manufacturer's defects. There is no warranty on broken parts such as twisted splines, broken shafts, or broken planetaries, nor is there coverage for labor or consequential damages.