GM 200-4R Transmission Superior Shift Correction Kit This Shift Correction Kit from Superior will improve all GM 200-R4 Transmissions from 1981-1990. This Shift Correction Kit helps eliminate the following problems: Sloppy 1-2 shifts, erratic 4-3 shifts, throttle valve sticking, inadequate line pressure rise, extends band life and improves overall performance. This Shift Correction Kit will come with installation directions in English and illustrations. We also offer a High Performance version of this Superior Shift Correction Kit. Please see my other listings!