Overview Reviews Product Description 558-405 Holley EFI GM 4L60/80E Transmission Harness GM 4L60/80E Transmission Harness - Complete terminated harness with j4 connector to operate GM electronic transmissions. for Dominator EFI Product Videos Custom Field Product Reviews Write a Review Write a Review × 558-405 Holley EFI GM 4L60/80E Transmission Harness Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *