The Most Advanced A340 / A341 / A343 Stand Alone Transmission Controller

The COMPUSHIFT Sport is the next generation of A340 / A341 / A343 transmission controller.

Why Choose COMPUSHIFT?

COMPUSHIFT is engineered for builders who demand precision, reliability, and control. Designed and manufactured in the USA by HGM Electronics (with over 30 years experience in transmission controller research and manufacturing), it delivers true stand-alone electronic control of the A340 / A341 / A343 with modern wireless tuning via app on your smart device, advanced diagnostics, and industry-leading hardware capability.

Whether you’re building a street car, restomod, 4x4, tow vehicle, or high-horsepower setup — COMPUSHIFT gives you full control over shifts and torque converter behavior.

The Right Connectors For Your A340 / A341 / A343 Stand Alone Transmission Controller

When you buy a COMPUSHIFT you will always get exactly the right plugs and cables you need for your A340 / A341 / A343 transmission and its specific application.

Plug and Play Connectors for A340 / A341 / A343 are Included

All our kits come with a full set of Plug and Play OEM Connectors because HGM always seeks to make connection easy.

Smart Phone Integration

The COMPUSHIFT A340 / A341 / A343 transmission controller is easy to setup and adjust using your phone. Adjust shift points, lock-up and shift quality. This makes setup easy using your Android or iOS smart phones, tablets, PC's and Mac's. Connectivity is via Bluetooth. All software is included.

Fully Customize Your A340 / A341 / A343 Transmission

Each COMPUSHIFT comes pre-set ready to install once you have answered a couple of the basic engine type, tire size and diff ratio questions. However, you can completely customize these settings to suit your exact preferences.

The COMPUSHIFT is also capable of communicating with many CAN Bus engine management systems such has AEM, Chrysler Hellcat Crate Engines, ECUMaster, Edelbrock, Emtron, Fast, FiTech, Ford Coyote (Gen1 and Gen2), GM LS Systems, Haltech, Holley, J1939, Megasquirt, Motec and MSD.

Installation Guide

The COMPUSHIFT Sport comes with an easy installation guide to make installing and configuring your Toyota/Lexus A340 / A341 / A343 stand alone transmission controller a breeze. This manual is available under Product Manuals on our Technical Support page.

Meticulously Engineered and Tested

COMPUSHIFT Transmission Controller with Plug and Play Harness

All COMPUSHIFT Sport A340 / A341 / A343 transmission controllers are supplied as a complete plug and play assembly.
Check out the below links for more information.

How it's Made

Every assembly has been proudly designed and built in the United States

Features

Click the headings below to see the outstanding features of the COMPUSHIFT A340 / A341 / A343 transmission controller.

Ease of Setup and Use

Built-in Bluetooth wireless connectivity
App-based setup, diagnostics, and tuning
No laptop required — phone or tablet setup
Optional laptop setup via USB or wireless
Preloaded base A340 / A341 / A343 controller calibrations for quick installation
Customizable App dashboard
Easy calibration sharing with tech support
Advanced data logging and charting
One-touch throttle position sensor (TPS) calibration

Comprehensive Instructions and Support

Personal US based 1 on 1 phone and email tech support for the COMPUSHIFT A340 / A341 / A343 controller.
Remote tech support is available over the internet where a member of our tech support team can log directly into your device to address any concerns.
Comprehensive online owner’s manual.
Quick installation guide.
Free software updates (reflash) are available at any time online via the App.
Software updates can be loaded via CAN, USB, or Bluetooth.

A340 / A341 / A343 Transmission Control

Adjustable shift speeds.
Adjustable shift feel.
Adjustable torque converter clutch control.
Configure 2 different calibrations or modes such as automatic/manual, tow/haul, calibration A/B. Controlled by either your App or an optional switch.
Lock-Up Switch compatible for 4x4 or long haul towing usage. This allows for 100% engine braking in most gears and significant fuel saving while towing.

Compatible with Industry Standards

A340 / A341 / A343 Plug and play harness made specifically for each transmission.
Paddle shift compatible.
Supports the widest range of transmission types and manufacturers.
Direct connection to the widest range of engine management systems (via CAN) for ease of setup/configuration.
CAN based interface to factory and aftermarket engine management systems.
Compatible with aftermarket throttle position sensors (TPS) which are available on our website.

Quality Manufacturing and Durability

Fully anodized billet aluminum housing for corrosion resistance and durability
IP65-rated sealed control module for moisture and dust protection
IP-rated harness connector with secure locking system
Designed and manufactured in the USA
Over 30 years of transmission controller expertise
Individually tested for performance, stability, and reliability
Compact, lightweight design for easy installation

Industry Leading Design

Advanced A340 / A341 / A343 transmission control fault detection with industry-standard diagnostic codes
Real-time diagnostics via App and onboard indicator lights
Supports nearly all transmission solenoid types
12 short-circuit protected solenoid drivers for reliability
Extensive sensor compatibility (speed, TPS, MAP, temperature)
22 configurable inputs/outputs for custom integrations
High-speed 32-bit processor for precise shift control
Advanced data logging with built-in accelerometer
Transfer case low-range detection for 4×4 applications

What Our Customers Are Saying

"Worked great right out of the box. Simple wiring facilitated easy hook up. The wireless app makes viewing the state of the trans controller easy and the adjustability is amazing. You can tune to your delight!"
Duval J.

"Excellent product, stellar customer service. This was the easiest standalone transmission controller l've ever used. Plus, they went above and beyond in the customer service after sale care. I have future projects and will be using them again. You will be beyond happy. It is worth every red cent."
Bruce L.

"Great product. Easy install and adjustment."
Todd D.

Check Out What Experts Say!

Get Your Pricing

Just answer a few questions below to see pricing and your COMPUSHIFT kit

Frequently Asked Questions

Click the headings below to get instant answers about the COMPUSHIFT A340 / A341 / A343 stand alone transmission controller.

What does a A340 / A341 / A343 transmission controller do?

An A340 / A341 / A343 transmission controller manages the electronic shifting, line pressure, and torque converter clutch operation of the A340 / A341 / A343 transmission. A stand-alone controller allows the transmission to operate in vehicles that do not use the original factory ECU, such as hot rods, restomods, engine swaps, and custom builds.

Why do I need a stand-alone controller for an A340 / A341 / A343?

The A340 / A341 / A343 transmission requires electronic control to shift correctly. If your vehicle does not have the original engine computer that controlled the transmission, a stand-alone controller is required to operate shift timing, line pressure, and torque converter lockup.

What vehicles can use the COMPUSHIFT A340 / A341 / A343 controller?

The COMPUSHIFT controller can be used in a wide range of vehicles including hot rods, restomods, muscle cars, classic trucks, off-road vehicles, and engine swap projects. It is compatible with carbureted engines as well as many aftermarket fuel injection systems.

Is the COMPUSHIFT controller difficult to install?

The COMPUSHIFT system is designed for straightforward installation using a dedicated plug-and-play wiring harness. The preset A340 / A341 / A343 settings allow you to get up and running right out of the box. Most installations require connecting power, ground, throttle position sensor input, speed sensors, and the transmission connector.

Can I adjust shift points and shift firmness?

Yes. The COMPUSHIFT controller allows full adjustment of shift points, line pressure, and shift feel. This allows users to tune the transmission for performance driving, towing, street cruising, or racing applications.

Does the COMPUSHIFT A340 / A341 / A343 controller support torque converter lockup?

Yes. The controller provides full torque converter clutch (TCC) control, allowing users to adjust when lockup occurs and under what conditions. Proper TCC tuning improves fuel economy, drivability, and transmission temperature.

Does the COMPUSHIFT controller work with carbureted engines?

Yes. The controller works with carbureted engines by using a throttle position sensor (TPS) mounted on the carburetor. This allows the controller to monitor engine load and control shifts correctly.

Can I tune the COMPUSHIFT transmission controller from my phone?

Yes. The COMPUSHIFT controller features Bluetooth connectivity and a mobile app that allows you to adjust transmission settings, monitor live data, and perform diagnostics directly from your smartphone or tablet.

What makes the COMPUSHIFT controller different from other A340 / A341 / A343 controllers?

The COMPUSHIFT system offers advanced tuning capability, Bluetooth wireless setup, powerful diagnostics, and extensive compatibility with different engines and vehicle types. It is designed to provide precise transmission control while remaining easy to install and configure.

Can the COMPUSHIFT controller improve transmission performance?

Yes. With proper tuning, the controller can improve shift quality, optimize shift timing, reduce heat, and improve overall drivability. This allows the A340 / A341 / A343 transmission to perform better in both street and performance applications.

Does the controller require a speed sensor?

Yes. The controller requires a vehicle speed signal in order to manage shift timing correctly. Most installations obtain this signal from the transmission output speed sensor or from an existing vehicle speed sensor.

Can the COMPUSHIFT A340 / A341 / A343 controller be used for performance or racing applications?

Yes. The controller allows full adjustment of shift points, line pressure, and torque converter clutch engagement, making it suitable for street performance, drag racing, towing, and high-performance builds.

Does the controller provide diagnostic information?

Yes. The system provides advanced diagnostics that can detect issues such as wiring faults, solenoid problems, or transmission errors. Diagnostic information is displayed through the mobile app using industry-standard fault codes.

Does the controller support paddle shifting or manual gear selection?

Yes. The COMPUSHIFT controller can be configured to support manual shifting using paddle shifters, buttons, or a manual mode switch. This allows drivers to select gears directly while still retaining full automatic control when desired.