Ford 2003 Mustang Workshop Manual page 478

new pinion bearings in the Specifications portion of this section.
For used pinion bearings, if the preload recorded prior to disassembly is lower than the
specification for used bearings, then tighten the nut to specification. Refer to torque
specifications for used pinion bearings in the Specifications portion of this section.
For used pinion bearings, if the preload recorded prior to disassembly is higher than the
specification for used bearings, then tighten the nut to the original reading as recorded.
18. CAUTION: 118 ml (4 oz) of Additive Friction Modifier C8AZ-19B546-A or equivalent
meeting Ford specification EST-M2C118-A must be used in the axle.
Lubricate each steel clutch plate and soak all friction plates for no less than 15 minutes.
Use Additive Friction Modifier C8AZ-19B546-A or equivalent meeting Ford specification
EST-M2C118-A.
19. CAUTION: Do not mix the clutch plates, clutch discs or shim from one side with the
other.
Assemble the differential clutch packs (without the shims) on their respective differential side
gear.