168 Tooth Flexplate SFI GM LS w/6L80E Trans

The TCI 168 Tooth Flexplate SFI GM LS with 6L80E Transmission is a precision-engineered flexplate designed for high-performance GM LS-series engine builds paired with the 6L80E automatic transmission. This internal balance flexplate delivers the rotational interface between the engine crankshaft and transmission torque converter with SFI 29.1 certification, meeting the safety standards required for street and competition applications. Built from steel construction, this component ensures reliable power transfer in LS-powered vehicles ranging from street cruisers to dedicated performance platforms.

The 168-tooth configuration is specifically matched to work with the 6L80E transmission, one of the most capable six-speed automatics in the LS ecosystem. The internal balance design means the flexplate is dynamically balanced as a complete unit with your specific crankshaft and torque converter combination, eliminating the need for separate balancing during installation. SFI 29.1 certification indicates this flexplate has undergone rigorous testing for burst containment and structural integrity, providing assurance that it will perform safely under sustained high-load conditions. Steel construction offers superior durability compared to cast alternatives, particularly in applications where heat and vibration from high-output engines demand reliability.

This flexplate is engineered for LS-series engine swaps and rebuild scenarios where the 6L80E automatic is the transmission of choice. Whether upgrading an existing LS platform, completing an engine swap into a classic muscle car or truck, or rebuilding a high-performance drivetrain, the correct flexplate ensures smooth engagement between engine and transmission while maintaining the integrity of power delivery. The 168-tooth count is critical for 6L80E compatibility—using an incorrect tooth count compromises starter engagement and transmission function.

The 6L80E transmission has become the go-to choice for LS enthusiasts seeking modern automatic performance with improved fuel economy and cooler operating temperatures compared to older GM automatics. Pairing it with a properly specified flexplate like the TCI 399757 ensures the engine and transmission work as an integrated system without compromise.