The planetary creates all of the different gear ratios that a transmission is able to produce. An automatic transmission contains two complete planetary gearsets folded together into one component. A planetary gearset has three main components: Sun Gear, Planet Gears and Carrier along with a Ring Gear. Each of these three components can be the input, the output or can be held stationary. Choosing which piece plays which role determines the gear ratio for the gearset. TCI? offers a variety of low gear replacement planetaries for several of the most popular Ford and GM transmissions. With additional gear reductions in both first and second gear, these gear sets work well in all applications requiring an additional gear for better take-off. From heavy drag cars to off-road 4x4s to tow trucks, a TCI? Low Gear Planetary can improve low end torque without adversely affecting the final drive ratio.

The original Torque Converters, Inc. turns cutting edge technology into a race winning tradition. When TCI® first opened its doors in 1968, it was a modest operation dedicated to delivering high performance transmission-related parts to a small group of devout drag racing enthusiasts. From those humble beginnings in Memphis, TN, TCI® has grown to be one of the largest and most technologically advanced manufacturers of high performance aftermarket drivetrain products in the world. Currently located in two large facilities in Ashland, MS, some 45 miles from parent company the COMP Performance Group™, TCI® continues to set trends and expand its line of quality transmission torque converter and accessory parts. The original directive, to deliver high performance racing torque converters, is still a core business for TCI®. However, the need for high performance street products, including high-quality automatic transmissions, has increased dramatically, led by an eager contingent of enthusiasts who enjoy improving the performance of their street driven vehicles. Because of these changing trends, TCI® business has changed considerably with 80 percent of their products targeted to street enthusiasts and 20 percent to hard-core drag and circle track racers.