Ford 2003 Mustang Workshop Manual page 312

206-09A .
8. CAUTION: Do not damage the wheel bearing oil seal.
Remove the axle shaft.
Installation
1. Lubricate the lip of the wheel bearing oil seal
Use Premium Long-Life Grease XG-1-C or equivalent meeting Ford specification ESA-
M1C75-B.
2. CAUTION: Do not damage the wheel bearing oil seal.
Install the two axle shafts.
3. CAUTION: Do not damage the rubber O-ring in the axle shaft groove.
Install the U-washer.