STANDALONE GEN III LS1/4L60e HARNESS

 GEN III LS1 Standalone Wiring Harness – 4L60E Transmission. Drive by cable. P59 PCM.

So you’re doing an LS swap, the last thing you want is wiring headaches. Our GEN III LS1 Standalone Harness is designed to eliminate the guesswork and get your engine running quickly, reliably, and cleanly.

Each harness is built in-house from start to finish and carefully assembled to deliver the same reliability you’d expect from factory wiring. Unlike generic aftermarket looms, every harness is fully tested on our engine stand before it leaves the shop, ensuring it meets or exceeds OEM standards.

Whether you’re swapping an LS into a classic truck, muscle car, or custom project, this harness is designed to make the job straightforward and dependable.

Why Builders Choose Our Harness:

Designed specifically for Gen 3 LS1 engines running a 4L60E transmission, making it ideal for standalone swap applications.

Every harness is installed and tested on our engine stand to confirm proper function before it reaches you.

We include an extra 36 inches of wiring, giving you the freedom to mount your PCM inside the cab, under the dash, or wherever suits your build best.

OEM-Level Quality

Carefully assembled to meet or exceed factory wiring standards, ensuring long-term reliability and clean installation.

Built In-House

No outsourced mass production. Every harness is built by us, for enthusiasts and builders who expect their parts to work the first time.

1-Year Warranty

We stand behind our work with a 12-month warranty on factory defects, so you can buy with confidence.

The Best Part — The Price!

High-end aftermarket standalone harnesses regularly sell for $1,600–$1,800+. Our harness delivers the same functionality, reliability, and testing for less than half the price.

Only $749.99

That means more budget left for the rest of your build.

If you’re building an LS swap and want OEM-quality wiring without paying premium aftermarket prices, this is the harness you’ve been looking for.

INSTRUCTIONS INCLUDED.

*Although we do make these standalone looms to be a simple as possible, professional installation is recommended.