Automatic transmission problem ford scar 94

I have a 94 Wagon Ford Escor, and this week the transmission began to fail.
Putting Da a lot to walk, I have to accelerate the engine a lot.
If I put in 1 (I think he says l) Alcara well,
I think the valves are stuck in one of the high speeds when I put the D.

I will uncover the box, change oil and filter, and I would like to wash the valves, but I have never opened a Ford box.

Does anyone have a manual of this type of transmission?
What else do you recommend reviewing?

Look, I recommend that you only change the oil and filter see what happens, because it is complicated the issue of automatic boxes, Chekea that first, how much mileage does your box have?

I intended to change oil and filter. But when removing the carter lid I see inside the transmission full of a rubber as if it were rubber, stuck in the filter in the valve box on the lid.

I decided to remove the valve box and disassemble it, and indeed, all ducts covered with that hard rubber, neither gasoline nor tinher removes that rubber.
I have a lot of work cleaning that valve box, when I finish I tell you if the problem was solved.
Although I am disarming everything very carefully I would thank you if someone happens to me diagrams or drawings of this transmission.
greetings