One problem related to universal joint has been reported for the 1997 Ford F-150. The most recently reported issues are listed below.
When in neutral and coasting down a hill, driveline rattles over bumps. Driveline clunks on acceleration or deceleration. Contacted dealer. Service manager checked the bulletins, Ford claims that it will not cause damage to anything in the driveline. Private mechanic said that it will over time.