Yes, the rear differential fill plug location is a bad design. The manual says to check the fluid after 90k, so I lifted the car and wanted to do the job. But I gave up after I saw it’s hidden behind the frame with a small clearance .... Can you share the wrench size, I plan to try your method.Just a rear diff, a transmission and a power transfer unit right next to the tranny.
I was just playing with you. The rear diff has no drain plug. And the rear sub-frame is almost right up against the fill plug. Here in this picture you can see that the gap between the fill plug and the sub-frame is barely enough to get an allen wrench in there. You my have to cut the allen wrench down a little. Let alone getting your tube in there to suck out the old fluid. Really poor design. I guess its another "throw away" unit that never needs servicing. Remember, life of the vehicle = warranty + 1 day.
The PTU looks doable, and its on my target list.