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TCI377503 - Transmission Control Unit (TCU) Wiring Harness - GM / Chevrolet 4T65/80E

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

Availability: Item has been discontinued and is no longer available


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.

Application List



  • 377503
  • 377503
  • TCI Transmission
  • Item has been discontinued and is no longer available
  • New


Shipping Information

  • Item Requires Shipping
  • 1.0 lbs.

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