Ford ATX Transmission Superior Shift Correction Kit This Shift Correction Kit from Superior will improve all ATX Transmissions from 1981-Up. This Shift Correction Kit helps eliminate the following problems: Sliding 3-2 kickdown, 2nd gear starts, no upshift when cold, inadequate line pressure, improves shift quality and will improve overall performance. This Shift Correction Kit will come with installation directions in English and illustrations.