GM Wire Harness Modification | GM LS Mod | LS1 Mod
GM Wire Modification & Repair
GM wiring modification for LS and LT systems — reconfigured for dependable engine and transmission operation at full power.
Modification service
GM Wiring Modification of LS and LT Wiring Systems
You must have the harness off of the donor LT1, TPI, or LS1 engine, undamaged. We re-configure and tail out what needs to be used to run the engine and transmission correctly at full power. This is a very complete service we offer — the wire harness will also look new.
Our customers use this service to deploy a new modern fuel-injected powerplant in sand rails, kit cars, off-road race rigs, street rods, and 4x4 trucks. You can place the modified wire harness anywhere space and location permits.
If you have a required length or drawn-up measurements for a specific engine that we produce a wire harness for, email us and we will let you know the cost. The wire harness shown above is the I6 4.2 engine from GM.
Built around your donor harness
What You Gain by Using / Modding Your Wiring
You save time and money by having SSW perform a wire harness modification on the donor LS or LT wire harness. You also cut the wait time and know 100% that all of the existing connectors fit on your motor.
Many times customers may have mismatched sensors and parts — you can make a note of this difference and SSW will change them out for the quoted price. When using a factory harness, SSW does not add length to the harness trunk. If you desire a longer harness, please look at our Pro Wire Harness section and scroll accordingly to the appropriate LS wire system you desire.
Straightforward pricing
In Closing
The Speed Scene Wiring harness modification service starts at $600.00 plus shipping. SSW does not offer a modification service for a lower price.
We provide a reliable and consistent service that must sustain a specific cost in order to exist. We spend more than 40 hours with your wiring, as well as program the operating system — it simply cannot be done for a cheaper price. As the old saying goes, you get what you pay for.
Ready to modify your GM harness?
Tell us about your donor harness, engine, transmission, and vehicle so we can help plan the right modification.
Start a build