One problem related to front suspension leaf spring has been reported for the 2005 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Ford F-150 based on all problems reported for the 2005 F-150.
Frame rusted and cracked, 72,000 miles. I'm the original owner. Note, all other underbody components appear normal for age and miles; though I don't have too much faith in rear drive shaft. Location is in front leaf spring attachment bracket adjacent to fuel tank.