How much Mobil 1 Diff oil will I need for both the front and the rear differential?

Don't forget the Transfer case also. I don't know, I had all 3 done for me and an oil change, all mobil one synthetics, at a Mobil One Express for $150.

The front needs 3 3/8 pints, the rear 3 3/4 pints. The transfer case needs 3 1/8 quarts of Nissan D ATF.

Should I have all of them done at the same time or just the rear? I am only at 3500 miles and want to get rid of that goo that i have read about in the rear diff. I say I am pretty knowledgable when it comes to cars but one question will I only have a front differential if I have a 4wd?