TransGo SK6L80 Shift Kit Fits 6L80 6L80E 6L90 6L90E Automatic Transmission. Includes: High Temp HD Clutch rings. Drop in Pressure Regulator valve. EPC relief assembly with new Boost valve. Drop in Solenoid Regulator valve assembly. (5) Pressure Switch repair elements. Fixes: Extreme Pressure Damage Due to Worn Pressure Regulator Valve Bore. Restores proper Pressure Regulator and Solenoid Regulator valve function. Convenient drop in valves. No special tooling or machining necessary. Repairs included for blown pressure switches.Has EPC relief assembly to protect against excessively high pressure. Improves and restores correct drivability with added durability.