TRANSMISSION - A4LD, 4R44E/4R55E, 5R55E - TORQUE CONVERTER SLIP - DIAGNOSTIC TROUBLE CODE (DTC) 628 OR P0741 STORED IN MEMORY
Publication Date: OCTOBER 27, 1997
1985-1993 MUSTANG 1987-1988 THUNDERBIRD
1985-1990 BRONCO II 1985-1997 RANGER 1987-1997 AEROSTAR 1991-1997 EXPLORER
Some vehicles may experience excessive torque converter slippage, torque converter not engaging, or Diagnostic Trouble Code (DTC) 628 or P0714 stored in memory. This may be caused by damage to the fluid pump support seal and/or to the groove on the pump where the seal is located.
Inspect the fluid pump seal for damage. Refer to the following Service Procedure for details.
Follow normal diagnostic procedures as listed in the appropriate Service Manual.
Inspect the fluid pump support for damage. If damaged, also inspect the fluid pump support seal groove on the pump.
If the groove is damaged, replace the pump.
If the groove is not damaged, replace the fluid pump support seal with a redesigned Seal (F77Z-7L323-AA). Refer to Figure 1.
Figure 1 - Article 97-22-4
Do not replace the torque converter unless it is damaged or fails the criteria listed in the appropriate Service Manual and/or refer to TSB