This is what I know from owning a NAS D110 since 1998, and per the original manual, and experience.
This combination of oil brand and weight are best for sub freezing and 100+ temps.
5W-50 Castrol Syntec, pour 6 quarts in the engine and 1/2 quart in the oil filter just before attaching
oil filter is the larger Mobile M1-301
change both every 3,500 miles or 8 months
Transfer case, Differentials:
75-90 weight, I use a company that puts moly in the oil it is made by Schaeffer
drain and pour in till it runs out the fill hole
total for both diffs and transfer case about 7 quarts so you have enough to run out the drain
change every two years or 25,000 miles
I use the one shot genuine LR tubes, but every two years I have to add a little, so I drain what I can, then fill.
If you have the LT77 (reverse is up and to the left) use any cheap ATF type F from the auto parts store and change every year. about 3 quarts with enough to run out the top just as the diffs and transfer box
I know there is much debate about the ATF, but trust me, if you live where it is cold you will have a tough time shifting using anything else.
Do not forget to grease the zerts with a grease gun. I think there are 6 locations on the drive shafts...
Best buy this from Rovers North too: CD ROM Tech Manual LHP28