I'll start here: at 195K miles, I don't know that the transmission fluid has ever been changed <insert shocked expressions and / or snarky responses here>.
When I got around to asking about it 50k miles ago, my regular fluids shop wouldn't do a flush. So I just kept driving. Yes, the x-fer case, diffs, and engine oil are all on schedule.
I'm putting together my 200K service list, and I really ought to do something about that transmission fluid and filter. I've looked at just the pan drop and filter exchange, and I've looked at the full drain / refill using the trans pump and emptying out through the cooler line. Y'all have done some fine work on those threads so far, and I thank you.
When I do, whichever I do, the transmission either will or won't work when I go to get back on the road. I've read the reasoning on both sides. I'm not necessarily looking for reassurance that everything will be OK (though if somebody out there has seen the transmission crap out after a similar procedure, it would be interesting to hear the story).
MY QUESTION IS: In the case that this procedure does fry the transmission, is there any way to get a sense of what would need to be done to get back up and running? What part(s) of the transmission would be affected? Am I talking full replacement, or swapping out some parts at a reputable shop? I know generally where the transmission is and overall what it does, but after that I'm a little fuzzy on the inner workings.
I will say that at the moment I don't have any transmission issues. Don't tow much ever. Take it pretty easy on the thing mostly.