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    We're closed on major holidays.

  • Standard order lead time for Standalone Harnesses:

    Gen V - 4-5 weeks

    Gen 3 or Gen 4 -1-2 weeks (Several LS3 kits in stock!)

    Need it sooner? Give us a call to discuss expediting. Limited slots available.

    All other items typically ship within 3-5 business days unless specified otherwise.

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LT4/8L90 Standalone Harness
LT4/8L90 Standalone Harness - Image 1 of 0
LT4/8L90 Standalone Harness - Video 2 of 1
LT4/8L90 Standalone Harness - Image 1 of 0
LT4/8L90 Standalone Harness - Video 2 of 1
LT4/8L90 Standalone Harness - Image 1 of 0
LT4/8L90 Standalone Harness - Video 2 of 1

LT4/8L90 Standalone Harness

$
Choose your options:
Fuel System:
Sending in ECM for reprogramming?(required):
Sending in TCM for reprogramming?(required):
Add MAF Sensor?:
Add O2 Sensors?:
Add NSS?:
Gear Ratio/Tire(required):
Pedal Connector(required):
Emissions Wiring(required):
Front End Drive(required):
Examples are Holley, Wegner, CVF Racing, Drive Junky, etc.
Engine Year:
Product Code: Gen5LT4-8L90
See top for lead time
Gen 5 LT4 / 8L90 standalone wiring harnesses are now available! Thinking about swapping the 650 HP Supercharged 6.2L engine into your project? Rest easy - we have your engine and transmission wiring covered!

Check out the video to see our wiring harness on our in house LT4/8L90 harness builder engine and transmission - just like every harness from Speartech, each LT4 harness will be built on this setup and test ran to ensure proper functionality before shipping!
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