Mitsubishi automatic transmission

Hello
I have a Mitsubishi Montero Sport Automatic Diesel Year 2007.
The direct is not activated and the engine is revolutionized over 3500 rpm and fuel consumption increases.
Minor speeds up to 60 kph change change.
I changed cash and filter oil but the problem persists.
It has 230,000 km of travel.

I need guidance

greetings

ricardo

You can have a bad seal

Hello, I am a mechanic teacher, your box with ESEKILOMETRAJE already wants a change of plates, filter oil discs and a good cleaning