There are two different kick down shift strategies, part throttle, no kick down solenoid activation, full throttle kick down, with the kick down solenoid activated. In Both strategies the pressure control valve,( Bowden cable )moves. AJUST the Bowden cable, make it tighter, no slack in the cable. The Bowden cable with the plastic adjustment nut have been know the lose its adjustment, if you car has it be aware.