Ford F-150 Owner's Manual page 446

Every 15000 miles (24000 km) or 12 months (whichever comes first)
Inspect front axle and U-joints. Lubricate if equipped with grease fittings (Four-wheel
drive vehicles).
Inspect half-shaft boots (if equipped).
Inspect steering linkage, ball joints, suspension, tie-rod ends, driveshaft and U-joints.
Lubricate if equipped with grease fittings.
Every 30000 miles (48000
km)
Every 97500 miles (156000
km)
Every 105000 miles
(168000 km)
Every 150000 miles
(240000 km)
*
Initial replacement at six years or 105000 miles (168000 kilometers), then every three
years or 45000 miles (72000 kilometers).
**
If not replaced, inspect every 15000 miles (24000 kilometers).
F150 (TF6) , enUSA
Scheduled Maintenance
Other maintenance items
Replace climate-controlled (heated and cooled) seat filter
(if equipped).
Replace engine air filter.
Replace spark plugs.
Change engine coolant.
Inspect accessory drive belt(s).
Change automatic transmission fluid and filter.
Change front axle fluid (Four-wheel drive vehicles).
Change rear axle fluid.
Change transfer case fluid (Four-wheel drive vehicles).
Replace accessory drive belt(s) if not replaced within the
last 100000 miles (160000 km).
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