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4L80E CAN Trans Controller by AMP EFI
4L80E CAN Trans Controller by AMP EFI

MicroSquirt CAN Transmission Controller with 4L80E Subharness

5 out of 5 based on 1 customer rating
(1 customer review )
MicroSquirt CAN Transmission Controller with 4L80E Subharness


Tuning Cable - MS3Pro EVO & ULTIMATE ECU's – optional

USB to Serial Adapter - Trouble Free!! – optional


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

  • 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

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1 review for MicroSquirt CAN Transmission Controller with 4L80E Subharness

    Only logged in customers who have purchased this product may write a review.

    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
      Q Do you need a tps for carbureted engines?
      Asked on July 1, 2017 5:06 pm
      There are no answers for this question yet. Answer now