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Ships within 48 hours · Estimated delivery Jul 25 - Jul 30
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Description
Holley EFI Transmission Harness - T-56 558-481Terminator X Max ECUs on V3 Build 100 or later Holley EFI V6 Build 300 or later Features: Specs: Brand Holley EFI Connector Quantity 4 Emission Code 3 Grade Type Performance Harness Application GM Harness Type Transmission Product Type Transmission Harness Warning California Proposition 65 Application: Year Make Model Submodel
Terminator X Max ECUs on V3 Build 100 or later - Holley EFI V6 Build 300 or later
Features:
Specs:
| Brand | Holley EFI |
|---|---|
| Connector Quantity | 4 |
| Emission Code | 3 |
| Grade Type | Performance |
| Harness Application | GM |
| Harness Type | Transmission |
| Product Type | Transmission Harness |
| Warning | California Proposition 65 |
Application:
| Year | Make | Model | Submodel |
|---|---|---|---|
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Better then oem
Great product quality is definitely a plus had no issues. Been buying these for 3 years.
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Reviewed in the United States on November 19, 2025
★★★★★ 5
Quality filters
Perfect fit, no issues with the installation of these filters.
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Reviewed in the United States on March 8, 2026
★★★★★ 5
Prompness
Great job
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Reviewed in the United States on March 23, 2026
★★★★★ 4
FEUL FILTER ISSUE
FEUL FILTER A PIT TIGHT TO INSTALLE
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Reviewed in the United States on September 18, 2023
★★★★★ 5
Quality part at reasonable price.
Had the exact same appearance as the Motorcraft kit. Installed the same and so far no issues at all. Cost on this was less than half of the Motorcraft kit.
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Reviewed in the United States on January 23, 2025