These are made to order and 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.

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. This harness does use the newer 4R100 style solenoid pack connector, so customers may need to swap it out with their connector and correct pin out to work properly on some E4ODs.

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.