MicroSquirt Transmission Controller & 4L80E Harness

Seamless, plug-and-play 4L80E control—standalone or fully integrated with MS3Pro. Take control of your GM 4L80E automatic transmission with the MicroSquirt Transmission Controller and 4L80E harness, engineered for both standalone use and plug-and-play integration with MS3Pro ECUs. Whether you're building a street machine, race car, or LS swap, this setup delivers reliable transmission management with minimal wiring and maximum performance. The included 4L80E-specific harness directly mates with our LS PNP 24x and 58x drop-on harnesses, offering a true zero-wiring experience for compatible setups. It includes wiring for the input shaft speed sensor and is pre-terminated for clean, professional installation. You can also use this as a standalone transmission controller. It only requires a few basic connections (power, ground, and CAN/serial) and is easily configured using TunerStudio. Note: This controller uses the later-style 4L80E connector (1994+). Earlier 1993 and older transmissions may have incompatible plugs. Key Features: Full control of 4L80E shift scheduling, line pressure, and TCC lockup CAN-based communication with MS3Pro for tight engine/trans coordination Designed for plug-and-play use with LS PNP 24x/58x harnesses Includes wiring for input shaft speed sensor Compact, sealed MicroSquirt controller for rugged environments Tuning support via TunerStudio What’s Included: MicroSquirt Transmission Controller Fully terminated 4L80E transmission harness 6-pin black connector for power, ground, and CAN bus 8-pin gray connector for optional digital inputs 18 crimp terminals for use with expansion connectors