Ford C6 Transmission Superior Shift Correction Kit This Shift Correction Kit from Superior will improve all C6 Transmissions from 1967-1990 for regular, heavy duty, towing & diesel applications. This Shift Correction Kit eliminates the following problems: Premature clutch & band failure, increases line pressure & lube flow, passing gear spin up, soft 1-2 shift, soft 2-3 shift, and clutch chatter. 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!