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Description
Pro-Dash Input/Output HarnessPro Dash Input Output Harness Overview Expanding on our Transmission Control options from Holley EFI. This new harness 558 455 from Holley EFI provides plug and play transmission control for the 2009+ GM 4L60 when used with a Dominator ECU. The 2009+ GM 4L60E contains an internal turbine speed sensor, which was not on the previous model year transmissions. Additionally, the valve body range selector is wired and controlled differently from the ECU.
Pro-Dash Input/Output HarnessOverview
Expanding on our Transmission Control options from Holley EFI. This new harness 558-455 from Holley EFI provides plug and play transmission control for the 2009+ GM 4L60 when used with a Dominator ECU. The 2009+ GM 4L60E contains an internal turbine speed sensor, which was not on the previous model year transmissions. Additionally, the valve body range selector is wired and controlled differently from the ECU.
Requires software version 5.0 build 100 or higher and ECU firmware 5.0 build 110 or higher
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Instruction Sheet
Instructions
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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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]
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4.7 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 4
Boys linen suit
Size: 10, Color: Light Blue
Looks great. Just wish it included a shirt
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
★★★★★ 5
Great product
Size: 10, Color: Light Champagne, Size: 10, Color: Light Champagne
Not bring the tshirts but fit really good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 10, 2025
★★★★★ 5
Very comfortable
Size: 14, Color: Light Green
I received so many compliments on my son’s outfit for graduation.
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Reviewed in the United States on June 26, 2025
★★★★★ 1
no pure white.
no pure white.
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Reviewed in the United States on February 4, 2026
★★★★★ 5
suit
Size: 12, Color: Beige
Very nice suit set. size 12. seems to fit as expected. I love the quality. It does have multi colored thread, as it is not solid.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 21, 2025
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