Hi,
As far as the stripped bolts, you really don't need to remove the entire pan. You will need to tap new threads into the transmission housing. Do you have a basic tap and die set?
As far as what happened, it isn't hard to do. The housing is aluminum with steel bolts going into it. They are easy to strip. You aren't the first and won't be the last. LOL You have no idea how many times they corrode and break on the way out.
As far as the missing bolts, if there is no leak and the others are tight, you should be okay. Just pay attention if it starts leaking. If it does, it won't be an all at once issue. It may start to seep.
Finally, I really feel you will be fine with the transmission. Although you really don't want it overfilled, for a short time, you will be okay. I do have a question for you. When you checked the fluid level, did you check it with the engine running and the transmission in neutral? I ask because if you checked it with the engine off, it can appear over full. Once started, the level will drop. It should be checked with the engine at operating temp and the engine running (idle) and the transmission in neutral. Double check the neutral idea. It will say on the dipstick if it should be in park or neutral, but on many trucks manufactured by Chrysler, it is neutral.
Try to relax. It really isn't as bad as it seems. I can help you get through it. Let me know the answers to the questions I asked so I can properly direct you. I'm here to help the best I can.
Take care,
Joe
Wednesday, January 8th, 2020 AT 6:32 PM