Ford 2003 Mustang Workshop Manual page 492

Final assembly
58. CAUTION: The machined surfaces on the differential housing and the differential
housing cover must be clean and free of oil before applying the new silicone sealant.
Cover the inside of the axle before cleaning the machined surface to prevent
contamination.
CAUTION: Install the differential housing cover within 15 minutes of applying the
silicone material.
CAUTION: Allow the sealant to cure for one hour before filling the axle with
lubricant.
Apply a continuous bead of sealant, of the specified thickness, to the differential housing cover
mounting surface.
Use Clear Silicone Rubber F7AZ-19554-CA or equivalent meeting Ford specification
ESB-M4G92-A.
59. Install the differential housing cover.
60. CAUTION: First fill the rear axle (4001) with 118 ml (4 oz) of Additive Friction
Modifier C8AZ-19B546-A or equivalent meeting Ford specification EST-M2C118-A.
Install the rear axle assembly in the vehicle. Fill the axle with the specified lubricant. For
additional information, refer to Axle Housing in this section.