It's not really my strong suit but i usually check the transmission fluid first to see if it smells burnt. Next up are the cooler lines, cooler, and pump.
Drop the pan and check the filter for metal pieces.
Check the servos and verify that they're doing their job. You start to run into electrical problems after a vehicle reaches a certain age. Quite a few fuel injected engines have the transmission shift controlled by the ECM. Kinda like fly by wire. Not like the old days when it was all done mechanically.
Again ... i dunno. The transmissions are generally pretty well made and seem to hold up under normal use. Hole shots or long trips hauling heavy loads are another matter.
Maybe verify that the problem isn't somewhere else before cracking the shell for a rebuild ? It would suck to put in all the time,money, and effort only to have it not work when you got the rebuild installed.
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