Ford 2003 Mustang Workshop Manual page 2537

SECTION 307-01: Automatic Transaxle/Transmission
DISASSEMBLY AND ASSEMBLY OF SUBASSEMBLIES
Torque Converter
1. A new or remanufactured torque converter must be installed if one or more of the following
statements is true:
A torque converter malfunction has been determined based on complete diagnostic
procedures.
Converter stud or studs, impeller hub or bushing are damaged.
Discoloration (due to overheating).
The torque converter is found to be out of specification when carrying out one of the
following torque converter checks:
One-Way Clutch Check
End Play Check
Stator to Turbine Interference Check
Stator to Impeller Interference Check
Torque Converter Leak Check
Evidence of transmission assembly or fluid contamination due to the following
transmission or converter failure modes:
Major metallic failure.
Multiple clutches or clutch plate failures.
Sufficient component wear which results in metallic contamination.
2003 Mustang Workshop Manual