Ford 2003 Mustang Workshop Manual page 192

2. Install the snap ring.
3. CAUTION: The bearing inner race must be supported during hub installation.
Failure to follow these instructions can damage the bearing.
Install the hub.
1. Position the knuckle in a press, making sure the wheel bearing inner race is supported
with the appropriate step plate adapter.
2. Using the special tool, install the hub.
4. Install the dust shield and new bolts.