You can easily find your part numbers on line using one of the online parts suppliers like RockAuto.com or a local supplier with an online catalog. Make sure their listing choices includes the F53 chassis.
Be sure to replace your fuel filter. It is located on the frame rail, driver's side, about 3' back from the front wheel. You'll need a Ford fuel line release tool to pull the fuel lines out of the gas filter.
Trans fluid was originally Mercon/Dexron and you would be fine with that but Ford updated the spec to Mercon V (five) which is a synth blend and holds up longer. Your tranny -should- have a drain plug on the torque converter. Remove the rubber plug on the bottom of the bellhousing and rotate the engine until the drain bolt appears.
BIG MUST DO!
Flush your brake system with new fluid. Brakes are so very important in these behemoths and the fluid should be replaced every 2 years. If there is any other signs of trouble or "pedal to the floor" just replace all components.
Here's the download to your chassis manual with capacities and more:
iRV2 Forums - Files - 96_F53_ChassisManual.pdf