Automatic box

I have a problem with the automatic box of a terrain TD27 Turbo engine, it takes a long time to pass the march, change oil and filter of the box and remain the same

It takes a lot or extends the marches a lot? that is, it happens to very high revolutions?

Pass them to very high revolutions

Friend, I would advise you to check the epicycloidal axis since it has an important role in the change of marches, you must check the state of the solar gear, planetarians (with its respective plane closure) and the crown. Check the olgure with the truck's workshop manual and verify that they are not past, but you should proceed to change them. I hope I have helped you in something greetings

I do not know exactly which box the end I think it is RL4R01A if this is check the TPS sensor or its equivalent for diesel and if it is the previous version of Guaya of envelope to graduate the same Hyast