As you don't know the maintenance history (a**umption), I would just use CHEAP fluids for the first change, don't waste money on expensive synthetics yet.
For engine oil, I recommend Shell Rotella 10w30 dino from Wal-Mart. Diesel motor oil will clean the years of sludge out of the engine.
For the differentials, cheap 75-90 gear oil.
For the AW4, cheap Dextron III if you can find it.
You should buy some commercial grade cooling system flush, the kind you put in and drive it for 500 miles, then flush and neutralize it, and fill with 50/50 mix coolant and distilled water. After the flush and before the refill, remove the thermostat housing and replace the thermostat. Use a Stant Premium 195 degree thermostat. Drill two holes in the thermostat flange, far enough in from the outer edge for that mounting and the gasket will not block them. Place the thermostat holes at 12 and 6 o'clock, the will aid in "burping" the system. Replace the pressure bottle cap with Stant 10224--it is a Volvo cap but it clears the hood and keeps a higher amount of pressure, and it will seal on the aftermarket bottles.
For the transfer case any automatic transmission fluid will do, might as well keep it the same as the AW4.
Flush the brake system with new DOT 3 fluid. Brake fluid is hygroscopic and pulls moisture from the air, and that moisture changes the brake fluid's properties--and not for the good. Rule of thumb, if you don't know when the brake fluid was last changed, or you can't remember, then it is time. Don't forget to inspect the rubber brake lines front and rear--when they get old they will "swell" when pressure is applied, and that reduces the effectiveness of the brakes--on a system where the brakes are not known for being good to start with.