TCI® 4x Four-Speed™ Transmission Packages for Externally Balanced Small Block Ford Applications

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Ashland, MS – TCI® announces the addition of externally balanced Small Block Ford 28 oz. and 50 oz. applications to the popular 4x transmission lineup.

The popular 4x Four-Speed™ line of automatic transmissions has added two new applications to its long list of applicable engines. The 4x electronic and non-electronic transmissions are now compatible with Small Block Ford engines using either a 28 oz. or 50 oz. external balance. This means that you now have the capability of easily running a 550 HP or 750 HP capable 700R4-based transmission behind your externally balanced SBF without the use of difficult adapter plates. If you need a transmission that can hold more than 750 horsepower, TCI® also offers an 875 HP capable 4L80E-based automatic transmission for these engines.

TCI® makes it easy to adapt these proven transmissions to any compatible engines by including the exact bellhousing, a special adapter flexplate, pilot adapter, dipstick and other accessories in a complete package. These kits bolt right up to your engine like a stock transmission.

The 700R4-based transmission uses a Constant Pressure Valve Body™ to eliminate the need for careful TV cable tuning, the most common cause of 700R4 transmission failure. If you choose the 4L80E-based 4x transmission, these controls are handled electronically by your choice of the TCI® EZ-TCU™, TCU 2.0™ or a factory GM transmission controller. All 4x transmissions are automatic overdrive four speeds with lock-up, so simply choose the one that fits your power level.

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About TCI®

When TCI® opened its doors in 1968, it was a modest operation dedicated to delivering high performance transmission-related parts to a small group of drag racers. 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. Now located 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.

For more information about TCI® and its products, visit us online at, or call us at 1.888.776.9824. Also follow us on Facebook at or Twitter at, or visit our YouTube channel at