The Summit Racing Performance Transmission SUM-700380-SFI is a high-performance automatic transmission designed for vehicles that require dependable power transfer, consistent shifting, and strong drivetrain durability. Built for performance applications and street-driven vehicles, this transmission system provides reliable gear changes and the strength required to handle increased horsepower and torque.

The TCI 6x 6-Speed GM 4L80E Automatic Transmission Packages 271701P39 is a professionally remanufactured high-performance transmission package engineered for serious street, pro touring, and racing applications. Capable of handling up to 850 horsepower, this advanced 6-speed automatic transmission combines the legendary durability of the 4L80E platform with modern overdrive technology, electronic control, and enhanced gear ratios for improved acceleration and cruising efficiency. Supplied as a complete package with controller, wiring harness, cooler, paddle shifter, and supporting components, it offers a comprehensive drivetrain solution for high-performance vehicle builds.