Mail-In Service

Mail-In LS Swap Base Tune

Choose your package, submit your build information, and check out online. We program your Gen III P01 or P59 PCM, or your Gen IV E38 ECM, with a startup/base calibration for your LS swap and mail it back ready to run.

  • ✓ Gen III P01/P59 & Gen IV E38 supported
  • ✓ Secure Stripe checkout
  • ✓ 1-2 business day turnaround
Start Your Order How Mail-In Works FAQ
From $100
+ $10 return shipping
Step 1

Choose Your ECU & Package

Gen III P01/P59: stock or bolt-ons → $100, aftermarket cam or different injectors → $150. Gen IV E38: stock → $200, modified → $250 (TCM included for 4L60E/4L80E).

Step 2

Customer & Build Information

Provide accurate details so your ECU can be programmed correctly the first time. Not sure where to find something? See where to find these numbers. Fields marked optional can be left blank and we will call you.

Return Shipping Address
Engine & ECU Details
Mail your TCM in the same box as your ECU. TCM setup is included.
Step 3

Order Summary

Stock / Near-Stock Base Tune $100
Return shipping $10
Total $110

You are responsible for the cost of mailing your ECU (and TCM, for Gen IV automatic swaps) to Midgard Industries. Return shipping to your address is included above.

Step 4

Required Agreements

Turnaround

Typical turnaround is 1-2 business days after the ECU is received.

Refund Policy

Orders are refundable before ECU programming begins. Once programming has started, refunds are not available.

ECU Damage Policy

Midgard Industries is not responsible for ECUs damaged during inbound or outbound shipping. Package your ECU securely.

Emissions Use

Tuning services are provided for off-road, competition, or emissions-exempt use only. Customer is responsible for compliance with local emissions laws.

You will be redirected to Stripe to complete payment. Card numbers are never stored on this website.

Questions before you order? Call or text (430) 215‑4536.

Process

How Mail-In Works

Everything you need to know before you box up your PCM.

Step 1

Order Online

Pick your package, enter your build details, and pay through Stripe. You will get an order number by email.

Step 2

Pack Your PCM

Send the PCM only (plus the TCM for Gen IV 4L60E/4L80E swaps), with no harness or brackets. Put it in an anti-static bag, wrap it in bubble wrap, and pack it snug in a box. Include a note with your order number.

Step 3

Ship It To Us

Midgard Industries
723 Harley Ridge Rd
Longview, TX 75604

Step 4

We Program & Return It

Typical turnaround is 1-2 business days after the ECU is received. Your PCM comes back using the $10 return shipping paid at checkout.

Service Details

What the Base Tune Includes

Every base startup tune covers the essential ECU changes required before an LS swap will start and run correctly in the new chassis.

Security

VATS Removal

The factory Vehicle Anti-Theft System is disabled so the engine will run in the new chassis without seeing the original GM security signal. Without this, the engine will start and immediately stall.

Fueling

Injector & MAP Setup

Injector flow rate, dead times, and offset data are configured to match the injectors installed on the engine. MAP sensor type and scaling are set to match the sensor in your build — 1-bar, 2-bar, or 3-bar.

Cooling

Electric Fan Control

Fan trigger temperatures, hysteresis, and A/C request logic are configured to match the cooling system in the new chassis. Unconfigured fan settings can lead to overheating on the first drive.

Drivetrain

Transmission Configuration

4L60E and 4L80E parameters are set for correct shift behavior in the new vehicle — shift tables, line pressure, TCC lockup strategy, and gear ratio matched to your rear axle and tire size.

Engine

Displacement & Diagnostics

Engine displacement is set to match the installed engine. Unused rear O2, catalytic converter, and emissions diagnostics are disabled to keep the ECU clean and free of nuisance fault codes.

Calibration

Base Startup Calibration

Fueling and spark tables are set to a safe, conservative starting baseline so the engine will idle and drive without causing damage while you work toward a full tune.

Applications

Perfect For

This service is designed for any LS swap project where the engine needs to be configured to run in a new chassis without the original GM security and vehicle systems.

LS Swap Projects

Any chassis receiving an LS engine for the first time.

Classic Trucks

C10s, Squarebodies, and other vintage GM trucks with LS swaps.

Muscle Cars

First-gen Camaros, Chevelles, and other classic A-body and F-body builds.

Off-Road Builds

Jeeps, Broncos, and custom off-road vehicles running an LS.

Project Cars

Any custom build or swap project that needs a clean starting baseline.

Compatibility

Supported ECUs

This service covers Gen III LS PCMs and the Gen IV E38 ECM. Gen III supports drive-by-cable and drive-by-wire throttle bodies; Gen IV is drive-by-wire.

Gen III — Red / Blue Connectors

P01 PCM

Used in 1999–2002 LS1/LS6 cars and trucks. One of the most common ECUs in LS swap builds. Fully supported for base startup tunes, VATS removal, and speed density configuration.

Gen III — Green / Blue Connectors

P59 PCM

Used in 2003–2007 LS1/LS2/LS6 applications. Expanded feature set over the P01 and widely used in performance swap builds. Fully supported for all base tune and optional setup items.

Gen IV — Manual, 4L60E, 4L80E

E38 ECM

Used in 2007+ Gen IV LS trucks and cars. Drive-by-wire only. Supported for manual, 4L60E, and 4L80E swaps. Automatic swaps include TCM setup — mail the TCM along with the ECM.

FAQ

Mail-In Base Tune FAQ

Most swaps do, as long as the build details on your order are accurate and the wiring, fuel system, and sensors are healthy. A base tune is a safe startup calibration, not a final dyno or wideband-verified tune, and programming cannot fix mechanical, wiring, fuel-system, or sensor problems. Run through the LS Swap Startup Checklist before the first crank.

A bigger cam changes idle airflow, idle spark, and startup fueling, so the tune will need to be updated. Contact us with your new cam specs and we will quote the changes. If the cam is going in before the first start, order the Cammed / Modified package.

Send the PCM that matches your engine harness and throttle. The P01 (1999–2002, red/blue connectors) is used with drive-by-cable, and the P59 (2003–2007, green/blue connectors) is used with drive-by-wire. Not sure which one you have? See P01 vs P59 LS ECU.

Yes. The Gen IV E38 ECM is supported for manual, 4L60E, and 4L80E swaps. The stock package is $200 and the cammed / modified package is $250. Select Gen IV at the top of the order form.

For Gen IV 4L60E and 4L80E swaps, yes. Mail the TCM in the same box as your E38 so both can be programmed to work together. TCM setup is included in the package price and return shipping does not change. Manual swaps only need the E38.

Yes. If you have HP Tuners or can read the PCM with PCM Hammer, a file-only service is available. Contact us before ordering and we will set it up.

Typical turnaround is 1-2 business days after the ECU is received. Shipping time to and from Longview, Texas is in addition to that.

Return shipping is $10 to any US address and is added at checkout. You pay to ship the PCM to us.

Manual transmissions and the 4L60E and 4L80E automatics. Shift behavior, line pressure, torque converter lockup, gear ratio, and tire size are all set for your build.
About

Charlie Moyer — Longview, Texas

LS swap tuning and EFI calibration specialist serving Longview, East Texas, and remote customers nationwide.

Email: charlie@midgardind.com
Phone: (430) 215‑4536
Start Your Order
Resources

Related LS Swap Resources

More guides and tools to help with your LS swap build.

Service

LS VATS Delete

Need VATS removal only? The standalone VATS delete service gets your PCM ready to run for $50.

Learn More
Guide

LS Swap Startup Checklist

Step-by-step checklist of everything to verify before cranking your LS swap for the first time.

View Checklist
Tool

LS Injector Size Calculator

Estimate the correct injector size for your LS build based on horsepower, fuel type, and duty cycle.

Open Calculator