You can buy the innards of the disconnect from teamcherokee.com / rockauto.com etc. for $6.99 each OR you can put them together yourself for about 80 cents apiece.
Inside, there is a plastic clip, two o-rings and a small hard plastic spacer (about the size of the o-rings). In the HELP! section of your local auto parts store you'll need the plactic clips. I think there are 6 in a package for $3.99 or so. They'll say they're for Fords or Chrysler (3/8"). Then you'll need o-rings. You need Nitrile or Buna-N rings...not just regular old rubber. Now you need the spacers...I've always saved and re-used my old ones, so I have no idea where to find those.
They go together like so. Slide the plastic clip over the line, with the "wings" on the clip towards the "rib" until it clicks over the rib. Then an o-ring, then a spacer, then an o-ring.
With all that ON the tranny line, just put a thin layer of Vaseline or clean tranny fluid on the o-rings and slide it into the female end until you hear/feel a little "click". You're done.
I did away with the PITA clips years ago on my first XJ and just cut & clamped rubber to hose, I do the same with all my Jeeps now. I know some guys insist on keeping it stock, but it works for me...and does not leak.
1990 XJ Laredo - White & Chrome
1988 MJ Pioneer - Metallic Green and Black