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.

A customer needed to add a 4L60E section to his wiring that was build for a manual transmission. I built it to the lengt...
09/04/2026

A customer needed to add a 4L60E section to his wiring that was build for a manual transmission.

I built it to the length he needed and labeled all the wires for him to install.

This was for a P01/P59 ECU.

$125 shipped

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NEW, GEN3 engine harness. This was built specifically for an engine test stand. This was $750 total. 🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺...
09/01/2026

NEW, GEN3 engine harness.

This was built specifically for an engine test stand.

This was $750 total.

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NEW, GEN3 harness shipped out today. All these pictures make them look the same. They are far from that. This one was or...
08/26/2026

NEW, GEN3 harness shipped out today.

All these pictures make them look the same. They are far from that.

This one was ordered ;

24x crank with front cam sensor
6.0/4L60E
DBC throttle
EV6 injectors
Speed density
LS3 MAP
ECU under seat mount

$750 to build this.

Call/Text 541-821-2993, message me here on Facebook, emails are still popular ([email protected])

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REBUILD harness for local pickup. This one was swapped to a cable throttle from electric throttle Swapped from the 4L80E...
08/21/2026

REBUILD harness for local pickup.

This one was swapped to a cable throttle from electric throttle

Swapped from the 4L80E to a 4L60E

And ECU mounted on the drivers inner fender.

$500 for this total, seamless braided loom included

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NEW, LS3/TR6060 harness built. This one was ordered for a GEN5 LT1 engine being swapped to port injection. I don’t know ...
08/14/2026

NEW, LS3/TR6060 harness built.

This one was ordered for a GEN5 LT1 engine being swapped to port injection. I don’t know any of the other details beyond the wiring that was ordered.

This harness was $775.

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REBUILT core harness sent to me, 6.2/6L80E. ECU getting mounted under the dash, and all the needed tap shift wires added...
08/07/2026

REBUILT core harness sent to me, 6.2/6L80E.

ECU getting mounted under the dash, and all the needed tap shift wires added for future use.

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All the frequently asked questions I get here;

Yes, this is is rebuilt harness that was sent to me in stock from. It was reloomed, and ECU relocated.

They are all labeled very clearly.

The seamless loom I use is not an upcharge, it’s part of every price quoted. I do not use lesser quality parts.

This particular harness pictured was $475

I am located in Medford Oregon.

My contact info is on this page, my website, my Instagram, my YouTube, TikTok page and Google. 541-821-2993

I do rebuild harnesses and build the new.

I build everything to order, nothing is in stock and ready to ship. That’s for new or rebuilt orders.

I can accept PayPal, Debit, Credit, Cashapp, Venmo.

Thanks everyone!!!

NEW, 6.0/6L80E engine/transmission wire harness. ECU will get mounted on the drivers side inner fender in his project. 🇺...
08/07/2026

NEW, 6.0/6L80E engine/transmission wire harness. ECU will get mounted on the drivers side inner fender in his project.

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Frequently asked questions here;

Yes, this is all new wire, new terminals, new loom, new connector housings.

They are all labeled very clearly.

The seamless loom I use is not an upcharge, it’s part of every price quoted. I do not use lesser quality parts.

This particular harness pictured was $775

I am located in Medford Oregon.

My contact info is on this page, my website, my Instagram, my YouTube, TikTok page and Google. 541-821-2993 call or text works.

I do rebuild harnesses also.

I build everything to order, nothing is in stock and ready to ship. That’s for new or rebuilt orders.

I can accept PayPal, Debit, Credit, Cashapp, Venmo.

Thank you everyone for following and sharing!! I appreciate it!

NEW, 6.2/4L80E harness built for local vehicle. He wanted the ECU/TCU set under the dash. Not a problem. 🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺...
08/03/2026

NEW, 6.2/4L80E harness built for local vehicle.

He wanted the ECU/TCU set under the dash. Not a problem.

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Ill try to answer all the frequently asked questions here;

Yes, this is all new wire, new terminals, new loom, new connector housings.

They are all labeled very clearly.

The seamless loom I use is not an upcharge, it’s part of every price quoted. I do not use lesser quality parts.

This particular harness pictured was $900

I am located in Medford Oregon.

My contact info is on this page, my website, my Instagram, my YouTube, TikTok page and Google. 541-821-2993

I do rebuild harnesses also.

I build everything to order, nothing is in stock and ready to ship. That’s for new or rebuilt orders.

I can accept PayPal, Debit, Credit, Cashapp, Venmo.

NEW built 24x GEN3 engine/transmission wire harness built. This one was ordered to mouths ECU on the passenger side inne...
08/02/2026

NEW built 24x GEN3 engine/transmission wire harness built.

This one was ordered to mouths ECU on the passenger side inner fender. So all the gauge wiring and OBDII were wired through the harness to be routed under the dash very well hidden.

Happy Sunday!

This one pictured was $750.

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Rebuilt GEN4 engine/transmission wiring. This started life from a 2015 L96 6.0/6L90e. Sent in to be rebuilt and converte...
07/23/2026

Rebuilt GEN4 engine/transmission wiring.

This started life from a 2015 L96 6.0/6L90e.

Sent in to be rebuilt and converted to a 4L80E.

Always Seamless loom!!

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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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