New member suburban tranny rebuild

[DylZim97]

Recently my 03 Chevy suburban and I where in an accident and I rebuilt the whole front end, the engine and nothing like that was damaged or pushed back because it was with a small car, but after replacing the radiator and air condenser and tranny cooler and a bunch more stuff, I took it out last night for its test drive cause everything was finally done and all the fluid levels where right, well I guess I didn't put one of the tranny cooler lines on tight enough and I knew the system I bought looked kinda cheap but it was up to standards for GM, anyways a lot of fluid leaked out and I maybe went an extra block after I noticed something was up so I could get to the closest parking lot and realized when I got out it was the hose I was worried about that pumps the tranny fluid into the tranny cooler so I parked it and shut it off and got more fluid and made sure all the levels where right and that's when I noticed all of a sudden it would not shift into 3rd-4th gear so me and a friend slowly got her home going about 10-15mph only using 1st gear is their anyone that might be able tell me something that might be wrong or what might have happened?? I have started a forum for any ideas on a rebuild kit that anyone recommended in case it does need to be rebuilt...