LS 4L80E Transmission Control Harness

Wiring made simple for your GM 4L80E—NO Controller Included

This listing is for the 4L80E plug-and-play transmission harness ONLY, designed to connect your GM 4L60E automatic transmission to a MicroSquirt transmission controller.

Perfect for LS swap builders, racers, and tuners who already own a MicroSquirt TCU, this harness makes installation quick and reliable—no cutting, no splicing, no guesswork. It’s the same harness included in our full 4L60E TCU kit and is engineered to plug directly into our LS 24x and 58x PNP Engine Harnesses.

Compatible with:

• GM 4L80E automatic transmissions (1994 and newer style connector)
• MicroSquirt-based transmission controllers

• MS3Pro setups via CAN bus

• Standalone TCU wiring setups

Note: This harness is not compatible with early 1993 or older 4L80E transmissions that use the original-style connector.
This listing is for the harness only—no MicroSquirt controller is included.

Key Features:

• Fully terminated, plug-and-play subharness for GM 4L80E

• OEM-style connectors for easy installation and secure fit

• Supports CAN communication with MS2, MS3, or another MicroSquirt ECU

• Includes wiring for the input shaft speed sensor

• Built for reliability with automotive-grade materials and loom

Included in this Package:

• Complete 4L80E transmission harness

• 6-pin black connector (for power, ground, and CAN)

• 8-pin gray connector (for additional digital inputs)

• 18 crimp pins for custom input connections and expansion

Need the controller too? Check out our MicroSquirt CAN Transmission Controller with 4L80E Harness for the full kit.