1. Change all fluids (engine oil, tranny, differential, transfer case fluids, coolant).
2. Check all other fluids (power steering fluid, brake fluid)
3. Adjust valves and install a new valve cover gasket
4. Lube all grease fittings (drive train/U-joints, ball joints, tie-rods)
5. check air filter, new one if needed
6. check front end for excessive play - does it need new bearings and/or ball joints? Failed bearings or ball joints can be very dangerous and expensive.
Have fun : )
Mike