Yes I was going to do mine with Transmax Z as I also use it in the auto and transfer case but it was to much of a pain to do a full flush myself.
Instead I bought Penrite power steering fluid and a fluid pump/syringe thing from a local auto store. Sucked the fluid out of the reservoir with the big syringe and re-filed then drove the car around the block and repeated the process three times. Now it is a nice clean red color again.
You can also take the hose off at the bottom, the lines go down the chassis across the round crossmember and up behind the grill for cooler. If you pull hose off at bottom you can drain almost all fluid.
another way is to remove return hose from res and put into a bucket. and then if you can keep up run the engine and top up as you go and it will literally flush the old crap out and fill with new at the same time. its best done with 2 people and just litterally start and straight away stop the engine a few times. works a treat.
but yes definitely flush it. its a small canister that works fairly hard. and oil does loose its ability to lubricate and also old fluid causes seals to dry out and fail sooner.