GM 125 & 125C Transmission Superior Shift Correction Kit This Shift Correction Kit from Superior will improve all 125 & 125C Transmissions from 1980-1994. This Shift Correction Kit solves or eliminates the following problems: Late shifts, weak shifts, band failure, harsh down shifts, converter shudder, convertor drain back and front seal problems. This Shift Correction Kit will come with installation directions in English and Spanish and illustrations. We offer a wide range of Superior Shift kits, rebuild kits and everything else you may need for your rebuild! Please see my other listings!