This is a 4L60E 4L65E 4L70E 4L75E VALVE BODY REBUILD SHIFT KIT for GM vehicles 1993-2007 Except Hybrid units. Fixes Code 1870 Trouble light & hard 1-2 shift No lock up or 4th Fixes harmonic bounce that wears out pump and valves and causes shuttle shifts Does not require transmission removal for proper installation