I have a 1997 5

I have a 1997 5.7L 4WD C/K 1500 with just over 128k miles. This past weekend I had the return coolant line pop off as I was heading down a local highway. I pulled the truck over immediately and had the truck towed home. The hose came off becuse the previous owner installed the hoses with a shotty hose clamp. Replaced the hose clamp, started the truck up and began to add trax fluid periodically engaging the trans to get the fluids flowing. After about 10 quarts the dipstick stayed at the full line. I decided to test the truck out and go around the block. Put it in drive, it lurched forward without giving it any gas and shifted into second fine then at about 25 mph or 2200rpms the clutch sounded like it was spinning freely. It didn't want third. I put the truck in reverse and went as fast as I safely could because I heard this has the chance of fixing this sort of thing, but no luck. I tried letting the truck sit idling for 45 minutes in hopes that the fluids just haven't worked their way completely through the transmission. I'm out of ideas. I refused to believe there is anything wrong with the tranny when there wasn't anything wrong before this hose came loose. Any suggestions?