TCI® Transmission Wiring Harnesses are fully pre-assembled and tested, making it easy to install even the most advanced computer-controlled transmission. TCU wiring harnesses feature all OEM-style connectors, high temperature oil resistant wiring and puncture-resistant outer sheathing for years of dependable service.

All connections are butt connected, crimped, and soldered for maximum mechanical and electrical integrity. These superb-quality harnesses feature clearly labeled connections, making them simple to install and vastly superior to trying to adapt a confusing, unlabeled factory harness to your new transmission controller.

So if you’re trying to follow the old engine swapper’s adage of “making the transmission think it’s still in the vehicle that it came from” a TCU wiring harness –available only from the drivetrain experts at TCI®, is the only way to run!