BAR,
You have to be specific about "drain & replace" vs "flushing" the transmission.
The latter obviously costs a whole lot more due to labor.
For the former, as low as $120 is possible. I did that at 30K and will do every 15K thereafter.
Drain & replace is a dilution process, you have to get the rest of dirty fluid out by
subsequent shorter interval.
Some here are scared of "flushing" transmission to kick off the debris lodged inside the transmission
causing even more issues soon after. This has happened often. IMHO, this happens because
the transmission fluid was not replaced for a long time. Fluid flushing might cause debris to be
kicked off. If one maintains the transmission like clockwork, I doubt flushing will harm the transmission.
At least that was what I learned from BMW forum a while back when I owned my 540iA.
Those guys did flushing themselves all the times. Nothing bad happened to their transmissions.
However, that is just my view. Others might disagree.
BTW, do we know who made the transfer case on CX9?
We know the transmission is from Aisin (who supplies to Lexus/Toyota/Volvo, and others - Aisin is owned by Toyota).
Likely the transfer case is also since it is attached to the transmission, but I am not sure. Can you find that out?
Thanks.