ok, so my 2000 chevy blazer was having cooling problems and i finally diagnosed after changing everything else that it was the radiator... so ordered and changed it and cooling is great never exceeds 200º now... but i noticed now i have a transmission fluid leak from the bottom trans line, i positive its seated... any suggestions? should i just take apart and reassemble?

 

Cross threaded connection?

 

If you've got crossed threads, you will need to replace both fittings. If they aren't cross threaded, you might want to try using an o-ring. Just make sure the o-ring can handle the pressure (not terribly high) and the trans oil.