Holley EFI

GM 4L60/80E Transmission Harness

$337.95

SKU: 558-405

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Holley EFI GM 4L60/80E Transmission Harness (Part # 558-405) is a fully terminated harness engineered to provide electronic control for GM 4L60E and 4L80E transmissions when used with a Holley Dominator EFI system. This harness utilizes a J4 connector, ensuring a direct interface for seamless integration. This harness is designed for pre-2009 GM 4L60E and 4L80E transmissions. It is not recommended for 4x4 applications that utilize electronic transfer cases. For 2009 and newer GM 4L60/80E transmissions, Holley EFI Part Number 558-455 should be used. The harness is sold individually and is a crucial component for integrating modern EFI control with these specific GM automatic transmissions. Holley EFI systems are widely adopted in racing and high-performance street applications, known for their ease of use and comprehensive features.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandHolley EFI
Part Number558-405
CategoryIgnitions and Electrical

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

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