How does the transmission lines come off at the transmission

Those are the marvelous "quick disconnect" lines if I'm not mistaken. There should be a little plastic cover over it and you pull that off and there is a little C shaped clip that goes over the fitting and retains it in the tranny. All you have to do is get a generally sharp point pick and pry up on one side and then just grab it with a pair of needle nose pliers. I just did one of these on a suburban and I hate them, just make sure to clean it off well so you can get your pick under it easily. Best of luck!