I just came in from the garage where I replaced the radiator on my 1999 Jeep Cherokee Classic. All was going well until I got to the bottom transmission line which was held in place by a metal clip with 4 prongs in the coupling to the radiator...the trouble was I didn't have a tool to remove the clip! A piece of thin wire did the trick: I just used a small flat-head screwdriver to pry each prong away from the side, then slid the wire behind until I had 3 prongs held in this way. I then pried in the fourth prong and...the coupling came loose!
The clip wasn't damaged, and went back together on the new radiator with no problem. Hope this helps!