I'll take any excuse to pull the welder out!
I made a jig for the 833 trans, one each for a 727 and 904, another for the 8 3/4 chunk.....
The A/T jigs have a flat plate with 4 steel tubes. I put long bolts through the tubes into the trans case so the jack clears ANY trans pan. I also made a jig for the transfer case in my Trail Duster.
Finally, I made one countoured to the A body k member since I was concerned that the puny original jack pad often seems close to slipping off.