Reading through the owner's manual of my 2018 A-Spec it seems like it's a good practice to change the read differential fluid at 7,500 miles and then ever 15,000 after that.

1. The manual also notes the fluid capacity for the transfer case, but no mention of the maintenance interval? Is there a suggested interval?
2. I am assuming that the front differential is combined with the transmission? Any recommended interval for fluid change outside of maintenance minder?