so the trans seems to be fine when it is cool but starts acting weird when warm?
if so,fix leaks obviously,drain and refill to correct level with correct fluid
dont know dodge but my chevy has,steel line from trans to bottom of rad,top of rad rubber line to bottom of cooler located in front of the rad,should be able to see it behind your grill,rubber line from top of cooler to top steel line going to trans,yours should be similar,if they bypassed the stock trans cooler in your rad that aftermarket cooler might not be enough to keep it cool,
i would make sure this is all correct and roll with it and see what happens
the engine,if you have a bunch of white smoke coming out of the tail pipe you probably popped a head gasket,if not and oil is clean,replace thermostat and gasket,on the bottom of your water pump there should be a little hole,is there any coolant there?replace water pump if no flow
here i will give you a crash course on mechanics,turn counterclockwise to loosen,clockwise to tighten
thats it,no rocket science here,no need to get upset,its life,take the mindset of you're educating yourself on your rig and basic mechanics and roll with it
haynes repair manual has all the info you will need