I have an 85 S10 with what I believe is the 700r4. Anyways yesterday i had to hit the passing gear and it went back into 4th but i stopped at a light and it would not downshift at all. Then it finally went into first at a light but it took a while to shift to 2nd. It wouldnt go over 10 mph and i had it floored but the rpms werent above 1500. I checked the fluid and its full. After it starts to act up I shut it off and let it sit for a while the it takes off perfect with no problems. Could this be a clogged screen? Sorry its off topic but no one seems to wanna help me on S10 forum. I need help guys.

 

hot no movement a lot of times is a bad torque converter. you need to verify it multiple times/ no reverse or forwards when hot(the torque converter doesn't discriminate).

 

It turns out it wasnt the tranny at all. I was checking the fluid and i smelled gas and I looked at the fuel pump and it was shooting gas all over the place. It just wasnt getting any gas to go. I put a new one in yesterday and I havent had a problem since. Thank god it was the fuel pump that wasnt in the tank. Im still gonna have it looked at by a tranny tec just to be safe. That explains my crappy gas milage.I cant believe It even ran with the fuel pump out. Good old Chevy's.

 

Glad to hear you figured it out before it lit on fire.
Makes ya kinda think, cars can do some funny things.