Some 1997-2006 Ford F-Super Duty vehicles may exhibit a driveline clunk or bump that occurs as the vehicle starts to move forward, following a stop. This condition may be caused by the slip yoke not sliding smoothly on the output shaft splines.
Lubricate the slip yoke with Motorcraft PTFE lubricant (D2AZ-19590-A).
Remove the driveshaft, being sure to matchmark the driveshaft prior to removal.
Lube the slip yoke with PTFE lube with 7-13 grams of the lubricant.
Re-index and install the driveshaft and verify the repair.