This information is in the E450 Scheduled Maintenance Guide. You can download it from Ford if it's not in your glovebox.
Use the Special Operating Conditions service.
The front wheel bearings also need to be repacked. There are a few grease fittings on the steering linkage. The original U-joints probably don't have grease fittings, but I'd look to be sure.
The rear spring u-bolts have to be retorqued once. There was a sheet about it in our documents. If you don't have it, send me a PM and I'll email it to you.
2011 Sunseeker 3100
1997 Pathfinder Toad