Let me be more specific.
I already check oil level and leaks and it is Ok.
Cooling water is clean.
Two weeks ago I was driving my 4R on the highway and it was slow and "forced" at 70MPH. Slowing down the speed I got the tranny switching gears very often.
I decided to change oil and filter and...
My 4R 93 is not working anymore.
Last week I was driving at about 70 MPH when I slow down the speed and felt the transmission was slipping. After pulling over, I checked underneath for oil leak and level. Everythging was Ok.
I started my way ahead and the trasnmission was slipping.
Some minutes...