Can't shift from 4 to final 5th gear. HDY101, year 1997

What is your question?

My LAND CRUISER, VX 1997, refuse to automatically shift to 530th gear from 430th gear. Gearbox have just been overhaul last week, but problem still remain. What needs to be the cause and what needs to be change? TPS, Throttle Position Sensor, or SHIFT SOLENOID? Or is it other problems that I need to check and replace?

What makes this problem better or worse?

MODEL: KR HDJ101K RNAGZ.