Change engine oil.
check spare for proper pressure.
Flush and replace engine coolant
Drain and refill transfer case (4x4)
Change rear axle fluid
Change front axle fluid (4x4)
Inspect brake linings
Replace air filter
Replace spark plugs
Inspect ignition cables
Inspect PCV Valve, replace as necessary
Drain and refill automatic transmission fluid, change main sump filter.
Inspect front accessory drive belt, replace as necessary.