I have a 1993 4t60e-hd in my fiero, I read what i could find on forum with other problems couldnt find much info. Few weeks ago i kept running low on trans fluid and never found a leak at all. I have an external cooler it does not run through cooler in radiator, I refilled the trans app 2 quarts low adding lucas trans junk, drove for couple hours then on way home it acted like it lost a gear rpms would go up as i accelerated but car barely move it is pulling some kinda like a slipping clutch in a 5sp... if i drop it into N for a few sec it will go along fine for a min or so and aslong as i keep accelerating it is fine when i stop accelerating it acts like i am applyin the brakes . Im thinking something to do with TCC but not sure what all it could be. I had noticed also a few days befor this happening when i went to reverse it wanted to take off backwards like accelerater is stuck ... any help would be greatly appreciated

I'd say you have two different problems:

Your TCC solonoid is sticking engaged occasional (the reverse takeoff symptom) and your TC itself is slipping like a bad dog. I'd predict your fluid doesn't look too great.

Losing fluid with no visible leaks usually means you're burning it up.

You should drop the pan and check out the magnet. That could rule out a coule things.
Your valvebody could be getting clogged up or it might be a solenoid issue. I was narrowing my "slipping clutch in a 5sp" issue down to the "A" solenoid I think.(I'll look it up when I get home from work)
My problem was similar but intermittent. I changed the fluid & filter (no flush). And haven't had any problems since this past friday.