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.

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

🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸

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.

New GEN4/6L80E harness build for a rear engine application. All the TAP Shift wiring for his specific application, addit...
04/17/2026

New GEN4/6L80E harness build for a rear engine application. All the TAP Shift wiring for his specific application, additional CAN wires added for an external module being added.

This harness was built for $775.

GEN3 engine wiring was sent to me to rebuild. All done and shipped. These are still the most cost effective way to get y...
04/15/2026

GEN3 engine wiring was sent to me to rebuild. All done and shipped.

These are still the most cost effective way to get your swap running and fit into your budget at the same time.

Local Friend/Shop (Allin Specialties) wiring install. I built this harness on the vehicle to get the exact location of e...
04/13/2026

Local Friend/Shop (Allin Specialties) wiring install.

I built this harness on the vehicle to get the exact location of everything, then final assembly done at my shop.

408”, LS9 blower running on a P01 ECU.

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Medford, OR
97504

Opening Hours

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

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