This product is available for pre-order starting on February 1, 2025, and will close on February 21, 2025. Once the pre-order period ends, orders will take approximately 6-8 weeks to ship. Please note that any order cancellations will be subject to a 25% cancellation fee, which will be deducted from the refund amount. Once pre-orders close out, all future orders will be priced at $350, built to order, and will have a 6-8 week lead time.

Developed in collaboration with Mad-Science Motorsports, our E4OD/4R100 Transmission Harness is designed to integrate with Holley Terminator X Max and Holley Dominator ECUs. This harness is compatible with 1995+ E4OD and 4R100 transmissions.

Since Holley does not natively support these transmissions, proper setup requires using Outputs 1 through 3 on a Terminator X Max or any available ground outputs on a Dominator ECU. Users with a Terminator X Max must de-pin these from the J1B connector and replace them with the three pre-terminated wires located near the ECU side of the harness.

A custom ECU tune is required for proper operation and Mad-Science Motorsports is able to provide this service. Please note:  M.F. Kustoms, L.L.C. does not provide tuning support for this product; however, we will provide harness-related support.

The harness includes two VSS pigtails to accommodate different sensor types used across various transmission models and years.