Skip to main content
Motor Life Events Community Support
Videos
Holley EFI

Holley EFI Transmission Harness - T-56 Magnum

Terminator X Max ECUs on V3 Build 100 or later - Holley EFI V6 Build 300 or later

Part # 558-480 Be the first to write a review

Holley EFI Transmission Harness - T-56 Magnum

In Stock
Free Shipping - Lower 48 US States
MSRP $237.95
$189.86
Save $48.09
Add to Wishlist
3

Emissions

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.

See Emissions Details

Also Bought

T-56 Magnum Transmission Harness - Terminated for VSS, Reverse Lockout, and Reverse Lights.

About Holley EFI

Find standalone EFI for LS, Coyote, Hemi and more at Holley.com. From engine swapping to managing up to 4000 horsepower, we have a solution for every project!

Brand Holley EFI
CategoryTransmission
Connector Quantity4
Emission Code3
Harness ApplicationGM
Harness TypeTransmission
Part TypeManual Transmission Wiring Harness
Product TypeTransmission Harness
Sub CategoryManual Transmission Components
UPC090127478400
Part Number558-480
3

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.


The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle


WARNING: It is against the law to install this part on an Emissions Controlled Vehicle


The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
Holley EFI Dealers
Do you need a custom kit built for your application? Do you need a system installed and tuned? Click here to find the Holley EFI dealer in your area!
EFI selection chart
Instructions - efi_selection_chart.pdf
Requires: Terminator X Max ECU with V3 Build 100, or Holley EFI Dominator ECU on Holley EFI V6 Build 300, or later.

We Suggest

Reviews

    Your Review

    *Free Shipping and Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.