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    Holley Transmission Harness, F-Body T-56 VSS/Reverse Lockout | 558-481

    Vendor: Holley EFI
    Part Number: 558-481
    Save $31
    $242.95 $273.95

    Currently out of stock.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
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    Product DetailsFAQReviewsRelated Products

    This transmission harness is terminated for vehicle speed sensor (VSS), reverse lockout, and reverse light signals on an F-Body T-56 manual transmission, for use with a Terminator X Max or Dominator ECU.

    Specifications:

    • Transmission: F-Body T-56
    • Harness Application: GM
    • Harness Type: Transmission
    • Terminated For: VSS, Reverse Lockout, Reverse Lights
    • Compatibility: Terminator X Max ECU on V3 Build 100 or later, or Dominator ECU on Holley EFI V6 Build 300 or later
    • Warning: California Proposition 65
    • Part Number: 558-481

    FAQ

    What transmission is the 558-481 harness for?

    The F-Body T-56 manual transmission.

    What ECU does this harness require?

    A Terminator X Max ECU on V3 Build 100 or later, or a Dominator ECU on Holley EFI V6 Build 300 or later.

    What signals does this harness handle?

    Vehicle speed sensor (VSS), reverse lockout, and reverse light signals.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy
    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy
    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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