Ford 2003 Mustang Workshop Manual page 2857

Clean the transmission exterior with solvent and dry with compressed air. During disassembly,
clean all components with solvent and dry with compressed air.
2. Remove the clutch release hub and bearing and the clutch release lever.
3. Attach the transmission to the special tool.
4. Rotate the transmission to a horizontal position.
5. NOTE: Position a drain pan under the transmission.
If the transmission was not drained during removal, drain the transmission.
6. Remove the vent hose.