Which one?
Just kidding, whether it is the AX15 manual or the AW4 automatic they are both good transmissions.
The AX15 needs a yellow-metal safe lubricant--GL3, MTL 90, Pennzoil Synchromesh, and good quality 10w30 motor oil, or the very expensive Mopar gear oil.
The AW4 is Dex III, that is until Chryco decided in 2007 that it was OK to run ATF+4 in it--note that that decision was made 6 years after they stopped using the AW4.