¿Why Transmission of my 1991 Ford Van does not pull?

My 1991 Ford E250 Truck 3 / 4 ton Van 5.8L Windsor FL 8, does not pull backward or forward. The transmission stopped working while driving at a speed of 40 mph, the engine starts well, and check the terminals of the solenoid valve body of the transmission, which gives me a reading of 20.4 ohms in four solenoids (shift solenoid1 , shif solenoid 2, converter clutch solenoid control, coast clutch solenoid) and 4.5 ohms in the remaining solenoid (electronic pressure control solenoid). But look at the problem here: the terminals of the sensor (sensor transmission oil temperature), which is integrated with solenoid valve body, gave me an open reading, is actually a thermistor and if in good or not very good condition should give me at least read ohms. Someone who has experience with this could help me ??????? What is the cause???? Sensor????

Check the fluid level, and check if the tras fluid is burned. I would suggest you go to harbor frieght and get a fluid suction kit and do a complete tranny flush, they usually cost like $20. also get a haynes manual, it will tell you how to do it , as well as fluid capacity, if that doesn't work and you have checked all of your
sensors/ soleinoids, then i would start looking for a good tranny shop to rebuild.

check if the tras fluid is burned

if it's brown/black... your clutch packs are toast

Check the fluid level whilst (1) engine off .... and again, (2) with engine idling.

If the fluid level does not dropped significantly between (1) and (2), the internal pump is not working. Pump shaft may be broken.