LSX Specialties

LSX Specialties We specialize in GEN3/4 LSX engine wiring and computer tuning. Any harness work, New and Used. Custom Tailored to order. I build new as well.
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Remote tuning, DYNO tuning, Street Tuning. I specialize in reworking stock GM harnesses. When reworking your stock harness, I will make it complete and simple for any level of mechanic to easily install. It will have a 4 wire hook up, Battery power, Ignition power, Fuel pump power and ground. I leave out the engine light, TCC and tach wire for you to connect to your dash cluster. I can add relays

and wire electric fans controlled by the computer if needed for additional charges. I will leave the signal wires out if you decide to wire them yourself. All of my harnesses come with an 8 port fuse box and fuel pump relay as a standard. Any transmission wiring will also be included. If you have me work on your PCM, I can make all the changes you will need for it to run properly without all emissions and rear O2 sensors. I can adjust speedometers, rev-limiters, Fan temps, injector size and anything else you may need.

EV6 injector harnesses built. Before and after pictures. This was 58’ of 18awg TXL crosslinked wire.
07/18/2026

EV6 injector harnesses built. Before and after pictures.

This was 58’ of 18awg TXL crosslinked wire.

Working late, getting a head start for tomorrow on this wire harness. Here are the 4L80E transmission parts before and a...
07/18/2026

Working late, getting a head start for tomorrow on this wire harness.

Here are the 4L80E transmission parts before and after.

This used 106’ of 18awg TXL crosslinked wire.

New GEN3 engine/transmission swap harness. This was built for a P59 ECU, DBW throttle. 5.3/4L80E with EV6 injectors plug...
07/15/2026

New GEN3 engine/transmission swap harness. This was built for a P59 ECU, DBW throttle. 5.3/4L80E with EV6 injectors plugs. I also added the 241C transfer case Speed sensor connector. No adapters needed here. Everything was built to his exact needs for a direct plug in.

Notice the SEAMLESS Loom, not taped/zipties on nylon split loom. No taped ends. Delphi/Aptive parts only! Legitimately built here in America, not a renamed Chinese product.

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Both of these ECU connectors are off of the same harness. One of them is stock the other I V***r blasted. All the REBUIL...
07/10/2026

Both of these ECU connectors are off of the same harness. One of them is stock the other I V***r blasted.

All the REBUILD harnesses I do will get the ECU connectors V***r blasted. They look new !!

Much better than a brush and solvent.

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NEW, GEN4 harness built to use a 4L80E. All new, all custom. Built in 18awg TXL crosslinked wire. Seamless loom as a sta...
07/09/2026

NEW, GEN4 harness built to use a 4L80E.

All new, all custom. Built in 18awg TXL crosslinked wire. Seamless loom as a standard, not an upgrade.

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Happy Birthday America!! 🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸
07/04/2026

Happy Birthday America!! 🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸

Rebuild, GEN3 harness brought to me locally. 4L80E swapped and rebuilt in all seamless loom. $450
07/01/2026

Rebuild, GEN3 harness brought to me locally.

4L80E swapped and rebuilt in all seamless loom.

$450

New GEN3 Harness build for local pickup. 6.0/TH400, Speed density for boost. I haven’t built a GEN3 in weeks! For all my...
06/25/2026

New GEN3 Harness build for local pickup.

6.0/TH400, Speed density for boost.

I haven’t built a GEN3 in weeks!

For all my new followers, everything posted on here is completely custom built to each order. I don’t keep anything in stock ready to ship. Always a perfect fit, no adapters needed.

This specific harness was $750.

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GEN4 5.3/4L80E harness built and shipped. These are becoming popular orders in the last few months. $900 for this one. 🇺...
06/20/2026

GEN4 5.3/4L80E harness built and shipped. These are becoming popular orders in the last few months.

$900 for this one.

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My favorite combination, LS3/TR6060. All new wiring and base tune done and shipped. All these pictures posted look the s...
06/12/2026

My favorite combination, LS3/TR6060. All new wiring and base tune done and shipped.

All these pictures posted look the same, but up close they are all build custom to the vehicle they are being installed in. Different O2 connections, Injectors, ECU locations, MAF types.

All of them are built by ME. 🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸

Address

Medford, OR
97504

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 12pm

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