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A successful LS Gen 4 swap starts with reliable wiring and proper engine management. At Swap Specialties in Ovid, MI, we build custom LS Gen 4 harnesses and provide programmed PCMs designed specifically for your application. Whether you're swapping an LS Gen 4 engine into a classic car, truck, off-road vehicle, or custom build, we create solutions that simplify installation and help ensure dependable performance.

Our LS Gen 4 harness and PCM solutions include:

Custom LS Gen 4 engine harnesses

Programmed PCMs ready to install

Standalone wiring solutions

Plug-and-play configurations

Custom wiring modifications

Every harness is built around your specific project to eliminate unnecessary wiring while maintaining the functionality you need. Contact us today to discuss your LS Gen 4 application.

Engine wiring and PCM programming play a critical role in the success of any LS Gen 4 swap. Generic solutions often create installation challenges, compatibility issues, and unnecessary troubleshooting. Our custom-built harnesses are designed to help simplify the process while delivering reliable performance.

Benefits of our LS Gen 4 harnesses and PCMs include:

• Simplified installation
• Reduced wiring complexity
• Improved reliability and drivability
• Proper communication between engine systems
• Support for custom tuning applications

Whether you're building a daily driver, performance vehicle, or custom project, the right wiring solution helps ensure everything works as intended.

Since 2016, Swap Specialties has helped customers complete successful engine swaps across a wide range of platforms. With more than 25 years of industry experience, over 15,000 harnesses built, and more than 1.35 million horsepower tuned, we understand what it takes to support dependable performance. Customers choose us because we offer:

• Industry-only lifetime warranty on harnesses
• 10% discount for military personnel and first responders
• Worldwide shipping available
• Store credit available on qualifying exchanges
• American-made products and components

We're committed to providing quality products backed by knowledgeable support throughout your build.

Whether you're replacing an existing harness or starting a complete LS Gen 4 swap, Swap Specialties has the products and experience to help. We'll work with you to identify the right harness and PCM solution for your specific build so you can move forward with confidence. Contact us today to discuss your LS Gen 4 harness and PCM requirements.