MicroSquirt CAN Transmission Controller with 4L80E Subharness


In stock

Product Description

4L80E Plug and Play Transmission Control via MicroSquirt

Seamlessly control your 4L80E transmission with MicroSquirt Transmission Control! The supplied 4L80E subharness provides a simple, plug and play integration with MS3Pro and directly mates with our LSx drop on harnesses; a perfect fit for GM 4L80E transmission. Includes wiring for the input shaft speed sensor.  This can be used as a standalone transmission control solution with minimal wiring involved, but was designed to be a full plug and play, zero wiring solution with our 24x & 58x harnesses.

Note that many 1993 and earlier 4L80E transmissions had a different connector – this unit uses the later style that was used in most 1994 and later transmissions.

Parts included

This package is available at an introductory price of $499 and includes the following items:

  • MicroSquirt Transmission Controller
  • USB thumb drive with software and instructions
  • Complete 4L80E wiring harness
  • 6 pin black connector for power, ground, and CAN bus
  • 8 pin gray connector for additional inputs
  • 18 crimp pins for the above connectors


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I've heard of a device called the MicroTCU. Is this a MicroTCU?

  • The MicroTCU is a different unit that has similar specifications, but it has not been put into production.

Is it waterproof?

  • No, but you can make it waterproof with a bit of RTV silicone around the edge of the case.

Are there other versions of the MicroSquirt for other functions? Transmission control or the "IO Box", for example?

  • These all use the same ECU, just running different code to change its function and use it as a transmission control unit or I/O expansion device. See for details.

Could I use two MicroSquirts, one running the engine and one running the transmission?

  • Yes. They would link up over their CAN networks to look like a single unit to the tuning software.

Where is this unit made?

  • They are built in the USA.

What do I need to tune this unit over USB?