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MicroSquirt CAN Transmission Controller with 4L80E Subharness


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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
  • 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

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?

Questions & Answers

  1. 0 votes

    A 4 pin HEI module tach output is off the negative terminal of the coil, so the voltage is too high for the input on the MicroSquirt. You can, however, swap to a 7 or 8 pin HEI, and use the "R" pin for a tach signal for the MicroSquirt. Leave the "E" and "B" pins disconnected, and it will behave as if it's a 4 pin module with a low voltage tach output.

  2. 0 votes

    You might be better off using a standard MicroSquirt as the harness won't be much use for non-GM transmissions. Supported transmissions include:

    • GM 4T40E
    • GM 4L60E
    • GM 4L80E
    • Toyota A341E
    • Ford 4R70W
    • Ford 4R100W (also called E4OD)
    • Mitsubishi W4A33

    The following have a few experimental installations but do not have full documentation:

    • GM 5L40E
    • Chrysler 41TE
  3. 0 votes

    It does need RPM, but coolant temperature is less critical. The RPM input is a simple pulsed signal; there's several ways you can get this depending on your ignition system.

  4. 0 votes

    Yes. This harness fits all but a few very early '90s versions of the 4L80E. We actually developed it using a transmission out of a slightly newer van.

  5. 0 votes

    The MicroSquirt is set up to use its VR2 input for the RPM signal. You can often get a suitable signal from the distributor pickup or, if using an MSD type ignition, a tach output on the ignition module.

  6. 0 votes

    Sure - this one can use either throttle position or MAP for engine load.

  7. 0 votes
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