Ive had problems also, with 4th, its would go up to 3rd but not 4th untill bout 80 or when it wants only on cold.
Also this mourning had a problem that was crusing in 4th 100km/h, auto decides to play funny an no rev response had to go back to 3rd to keep goin, turned car off waited 2mins started her back up all fine
Dam r34 autos lol, what the price of a manual conversion?