Ford 2003 Mustang Workshop Manual page 422

clutch spring (4214). Failure to follow these instructions may result in personal injury.
Remove the differential clutch spring.
7. Remove the differential gears.
1. Remove the two differential pinion gears (4215).
2. Remove the two differential side gears (4236).
3. Remove the two differential pinion thrust washers (4230).
8. CAUTION: Keep the differential clutch packs (4947) in order. Do not mix them.
Always reassemble them in the same sequence.
Separate the differential clutch packs and shims from the differential side gears and tag them
"right" and "left".
Clean and inspect the remaining differential components for wear and damage and install
new parts as necessary.