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LS & LT Harnesses and Accessories

Upgrade your classic car or truck with the latest in LS/LT engine technology using Classic Performance Products' (CPP) wide range of LS/LT Harnesses and Accessories. As a trusted source for aftermarket parts, CPP provides ... everything you need for a easy and hassle-free LS or LT engine swap in your classic vehicle.

Everything You Need for LS/LT Engine Swaps
At CPP, we understand the intricacies involved in updating your classic ride with modern performance. That's why we offer an extensive selection of high-quality LS/LT engine wiring harnesses, electrical components, and accessories tailored specifically for classic cars and trucks. Whether you're working on a Chevy truck, Chevy Tri-Five, Camaro, Nova, Chevelle, El Camino, or even Ford cars and trucks, our products are designed for precise fitment and

Quality and Compatibility You Can Trust
Our LS/LT harnesses and accessories are engineered for durability and reliability, ensuring your engine swap project is both efficient and successful. From individual components to complete turnkey standalone harnesses, we provide everything needed to power your LS engine swap, delivering long-lasting performance and meeting the distinct demands of a variety of classic makes and models.

Seamless Integration for a Smooth Upgrade
With CPP's range of LS/LT products, you can expect seamless integration into your classic vehicle. Our harnesses and accessories are designed to simplify your engine conversion process, offering reliable connections and reducing installation time. This means you'll spend less time troubleshooting and more time enjoying the powerful performance of your upgraded engine.

Choose Classic Performance Products for all your LS/LT harness and accessory needs, and experience unrivaled quality, compatibility, and customer support. Trust us to deliver the products that make your classic car's LS or LT engine upgrade smooth, reliable, and hassle-free.

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  1. PSI Gen IV Manual Standalone Wiring Harness w/ T56/TR6060

    2008-2013 LS3 Manual Transmission with T56/TR6060

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    In Stock
    Part # HAR-1037
    0%
    $569.00
  2. PSI DBC LS1 w/ 4L60E Standalone Wiring Harness

    1997-2002 LS1 with 4L60E

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    In Stock
    Part # HAR-1012
    0%
    $549.00
  3. PSI 58X w/ 4L60E Wiring Harness DBW

    2008 LS2 6.0L 58x with 4L60E

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    In Stock
    Part # HAR-1066
    0%
    $659.00
  4. PSI Vortec LY6/L92 Standalone Wiring Harness

    2007-2008 Vortec LY6/L92

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    In Stock
    Part # HAR-1040
    0%
    $659.00
  5. PSI Auto Trans Wiring Harness w/ 6L80E for 2008-2013 LS3 6.2L Automatic Transmission with 6L80E

    2008-2013 LS3 6.2L Automatic Transmission with 6L80E

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    In Stock
    Part # HAR-1071
    0%
    $719.00
  6. PSI Vortec w/ 6L80E Auto Transmission Wiring Harness

    2006-2013 LS7 Vortec with 6L80E Auto Transmission

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    In Stock
    Part # HAR-1070
    0%
    $719.00
  7. PSI Wiring Harness w/ 4L60E

    2010-2013 L99 with 4L60E

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    In Stock
    Part # HAR-1068
    0%
    $659.00
  8. PSI 58X Automatic Transmission Wiring Harness w/ 6L80E

    2006-2007 LS2 6.0L 58x Automatic Transmission with 6L80E

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    In Stock
    Part # HAR-1077
    0%
    $719.00
  9. PSI Vortec DBW w/ 4L60E Standalone Wiring Harness

    2003-2007 Chevy & GMC Vortec with 4L60E, DBW

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    In Stock
    Part # HAR-1014
    0%
    $579.00
  10. PSI Vortec DBW w/ 4L60E / 4L80E Standalone Wiring Harness

    5-Pin (A/C)

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    In Stock
    Part # HAR-1084
    0%
    $614.00
  11. PSI DBC Standalone Wiring Harness w/ LS3 Injectors

    1999-2006 Vortec Chevy, GMC, Cadillac and Hummer Truck Engines with T56 with LS3 Injectors

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    In Stock
    Part # HAR-1092
    0%
    $549.00
  12. PSI T56/TR6060 Manual Transmission Wiring Harness

    T56 or TR6060 Manual Transmission

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    In Stock
    Part # HAR-1065
    0%
    $569.00
  13. PSI Vortec Tac Module Harness

    Vortec

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    In Stock
    Part # HAR-1025
    0%
    $45.00
  14. PSI Gen IV Engine w/ 6L80E Standalone Wiring Harness

    2006-Present 58x Engines with 6L80 or 6L90E

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    In Stock
    Part # HAR-1086
    0%
    $719.00
  15. PSI DBW w/ T56/TR6060 Wiring Harness

    2010-2013 T56/TR6060

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    In Stock
    Part # HAR-1067
    0%
    $569.00
  16. PSI Auto Trans L76 Wiring Harness w/ 6L80E

    2008-2009 L76 with 6L80E

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    In Stock
    Part # HAR-1075
    0%
    $719.00
  17. PSI Auto Trans Wiring Harness w/ 6L80E for 2008 LS2 6.0L Auto Transmission with 6L80E

    2008 LS2 6.0L Auto Transmission with 6L80E

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    In Stock
    Part # HAR-1078
    0%
    $719.00
  18. PSI DBC LS1 w/ T56 Standalone Wiring Harness

    1997-2002 LS1 with T56

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    In Stock
    Part # HAR-1013
    0%
    $549.00
  19. PSI DBC Wire Harness Auto Trans 4L60 Delphi

    1999-2003 Vortec Automatic Transmission 4L60 Delphi

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    In Stock
    Part # HAR-1018
    0%
    $549.00
  20. PSI Gen IV Wire Harness w/ 4L60E Auto Transmission

    2008-2009 L76 with 4L60E

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    In Stock
    Part # HAR-1046
    0%
    $659.00
  21. PSI Vortec DBW w/ 4L60E Standalone Wiring Harness w/ LS1 Injectors

    1999-2006 Vortec Chevy, GMC, Cadillac and Hummer Truck Engines with 4L60E with LS1 Injectors

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    In Stock
    Part # HAR-1090
    0%
    $549.00
  22. Go Shift GM 4L60/4L80 Transmission Controller

    Go Shift Stand Alone Trans Control Unit GM/ 4L60/ 4L65/ 4L80/ 4L85

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    In Stock
    Part # FI20010
    0%
    $599.00
  23. PSI Gen IV Standalone Wiring Harness w/ 4L60E

    2008-2013 LS3 with 4L60E

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    In Stock
    Part # HAR-1038
    0%
    $659.00
  24. PSI Conversion LS Wiring Harness for 2005-2006 GM LS2 with 4L60E

    2005-2006 GM LS2 with 4L60E

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    In Stock
    Part # HAR-1094
    0%
    $664.00
  25. PSI DBW T56 Standalone Wiring Harness

    2002 Vortec T56, DBW

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    In Stock
    Part # HAR-1085
    0%
    $599.00
  26. PSI DBC LT1/LT4 w/ T56 Standalone Wiring Harness

    1994-1995 Vortec LT1 or LT4 with T56

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    In Stock
    Part # HAR-1006
    0%
    $519.00
  27. PSI Vortec w/ T56 Standalone Wiring Harness w/ LS1 Injectors

    1999-2006 Vortec Chevy, GMC, Cadillac and Hummer Truck Engines with T56 with LS1 Injectors

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    In Stock
    Part # HAR-1091
    0%
    $549.00
  28. PSI Wiring Harness LY6 w/ 6L80E

    2009-2013 6.0L or 6.2L LY6 with 6L80E

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    In Stock
    Part # HAR-1074
    0%
    $719.00
  29. PSI LS1 Tac Module Harness

    LS1

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    In Stock
    Part # HAR-1022
    0%
    $45.00
  30. PSI Vortec DBC w/ 4L80E Standalone Wire Harness

    1991-2003 Vortec with 4L80E with Electronic Auto Transmission

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    In Stock
    Part # HAR-1018-UG
    0%
    $549.00
  31. PSI Vortec w/ 4L60E Standalone Wiring Harness

    Vortec with 4L60E with EV6 Injectors

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    In Stock
    Part # HAR-1030
    0%
    $579.00
  32. PSI DBW LS2 58X w/ 4L60E Wiring Harness

    2005-2007 LS2 58x with 4L60E

    Add to Compare
    In Stock
    Part # HAR-1064
    0%
    $659.00
  33. PSI Conversion LS Wiring Harness for 2009-2015 LS 58X with 6L80E or 6L90E

    2009-2015 LS 58X with 6L80E or 6L90E

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    In Stock
    Part # HAR-1098
    0%
    $819.00
  34. PSI Wiring Harness LH6 w/ 6L80E w/ EV6 Injectors

    2005-2014 LH6 with 6L80E with EV6 Injectors

    Add to Compare
    In Stock
    Part # HAR-1058
    0%
    $589.00
  35. PSI Standalone Wiring Harness w/ 4L60E

    4L60E

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    In Stock
    Part # HAR-1016
    0%
    $599.00
  36. PSI Gen IV Auto Transmission Wiring Harness 4L60E

    Auto Transmission with 4L60E

    Add to Compare
    In Stock
    Part # HAR-1036
    0%
    $659.00
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