transgo shift kit 8l45 8l90 2015 upTransgo Shift Kit Valve Body Repair Kit for 8L45, 8L90 2015 UP This TransGo 8L90 SHIFT KIT provides essential components to resolve common issues in GM 8L45 and 8L90 transmissions. Corrects Prevents Reduces: TCC instability and overheating Secondary regulator circuit cracking Converter feed loss Codes P0218, P0741 High line, harsh shifts Low line, soft slipping shifts Broken parts, low cooler flow Includes: Drop in PR and shuttle valve assembly Drop