MSD Ignition Transmission Wiring Harness Kit, Atomic TCU to 4L70E SKU MSD-2771 $229.95 Quantity discounts available QuantityPrice (0)No Reviews yet Number of Pieces Item Custom Price Quantity -+ Add to Cart Details Use this harness to connect the Atomic TCU to your specific transmission. For use with Atomic TCM. Details Back DetailsUse this harness to connect the Atomic TCU to your specific transmission. For use with Atomic TCM. Ratings & ReviewsNo reviews availableBe the first to Write a Review