Maintenance intevals
Here is what Ford recommends for my 2000 Sport with 5R55E:
Every 5,000 miles:
Engine oil & filter
Every 30,000 miles:
fuel filter, air filter, engine coolant
Every 100,000 miles:
PCV valve, spark plugs
Every 150,000 miles:
ATF & filter, rear axle lubricant (never for synthetic unless contaminated with water)
My personal deviations to above:
Every year (I don't drive 5,000 miles per year):
Clean MAF sensor, clean IAC valve, clean & reoil air filter, add fuel injector cleaner to fuel tank, replace remote engine full flow and bypass oil filters, replace remote ATF filter
Every 50,000 miles:
PCV valve, spark plugs and wires, ATF
Every 75,000 miles
Upper front and rear timing chain tensioners
Every 150,000 miles:
Synthetic rear axle lubricant
The only time I will replace my in the transmission filter is when it's rebuilt because it's really just a screen and I have a remote full flow type filter