Ford 2003 Mustang Workshop Manual page 423

9. CAUTION: Do not use acids or solvents when cleaning the differential clutch pack.
Wipe components only with a clean, lint-free cloth.
Clean and inspect the differential clutch packs for wear and damage and install new parts as
necessary.
Assembly
1. CAUTION: 118 ml (4 oz) of the specified Ford Friction Modifier 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
2. CAUTION: Do not mix the differential clutch packs or shims from one side with the
other.
Assemble the differential clutch packs (without the shims) on their respective differential side
gears.