OK.
1: The "front differential" is the transmission (it's called a transaxle for a reason)
it uses T/IV transmission fluid.
2: The transfer case is called a transfer assembly, it transfers power to the rear wheels only, you can not shift out of all-wheel drive. It uses 80/90 gear oil.
2a: The transaxle and transfer assembly do not "share" fluid, that would be bad.
3: The rear axle is just that, and it uses 80/90 gear oil.
(The transaxle does have two drain plugs, one in the pan and the other one on the bottom of the diff. part.) But you fill both through the transmission dipstick.
About 4 quarts on a drain and fill. The transmission doesn't use a filter, just a metal screen.