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.

New, LS3/6L80E wiring harness built custom for CARTZILLA 3.0. (Las Vegas Attraction)This is built with all Emissions com...
06/05/2026

New, LS3/6L80E wiring harness built custom for CARTZILLA 3.0. (Las Vegas Attraction)

This is built with all Emissions components to pass Nevada inspection.

$825 total

Customer ride!LS3 all wired by Derek with LSX Specialties harness, Looks great!!
06/05/2026

Customer ride!

LS3 all wired by Derek with LSX Specialties harness, Looks great!!

New LSA/6L80E harness built. This is a real 2011 CTSV LSA engine using the E67 ECU.$825🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸
06/01/2026

New LSA/6L80E harness built.

This is a real 2011 CTSV LSA engine using the E67 ECU.

$825

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2011 LS3 with a 4L70E harness build. TCM and base tune supplied using customers ECU. Not a very common combination, but ...
05/28/2026

2011 LS3 with a 4L70E harness build. TCM and base tune supplied using customers ECU.

Not a very common combination, but not a problem.

$900 for this harness

New, LS3 with a 6L80E wiring done, ECU and base tune supplied also. This was $1131 shipped🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸
05/22/2026

New, LS3 with a 6L80E wiring done, ECU and base tune supplied also.

This was $1131 shipped

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New, 2009 LY6 6.0 harness build and shipped.This is going into an Airboat, very custom lengths and locations of things.$...
05/19/2026

New, 2009 LY6 6.0 harness build and shipped.

This is going into an Airboat, very custom lengths and locations of things.

$775 for this

Engine horsepower is not wheel horsepower. Here is the explanation of it.
05/06/2026

Engine horsepower is not wheel horsepower. Here is the explanation of it.

GEN4, 58x/6L80E done and shipped. Added wiring for Tapshift module, dual OBDII ports and long enough to get routed the w...
05/04/2026

GEN4, 58x/6L80E done and shipped.

Added wiring for Tapshift module, dual OBDII ports and long enough to get routed the way it needs around the AC system.

$775 total

New GEN3 24x Engine/Transmission wiring shipped out. These are always custom to your needs. No adapters needed here. $75...
05/04/2026

New GEN3 24x Engine/Transmission wiring shipped out.

These are always custom to your needs. No adapters needed here.

$750 total

New, custom Holley Terminator X harness built and shipped. I use shielded wire for Cam and Crank, and everything is buil...
04/23/2026

New, custom Holley Terminator X harness built and shipped.

I use shielded wire for Cam and Crank, and everything is built to your needs, without adapters or sub-harnesses. Alternator wiring added, and a small fuse block giving everything separate fuses and a fuel pump circuit separated on its own relay and fuse.

This was $681 shipped.

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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