Ford actually has a part number for the Magnefine filter, because they expect it to be used when replacing a transmission.
TSB
00-23-10
* TRANSMISSION - FLUID IN-LINE FILTER KIT - REPEAT REPAIRS OF TRANSMISSION - SERVICE TIPS
Publication Date: NOVEMBER 6, 2000
FORD:
1980-1997 THUNDERBIRD
1980-2001 CROWN VICTORIA
1984-2001 MUSTANG
1985-1990 BRONCO II
1985-2001 RANGER
1987-1997 AEROSTAR
1989-1996 BRONCO
1989-1997 F SUPER DUTY, F-250 HD
1989-2001 ECONOLINE, F-150, F-250 LD, F-350, F-450
1991-2002 EXPLORER
1997-2001 EXPEDITION
1999-2001 F-250 HD, SUPER DUTY F SERIES
2000-2001 EXCURSION
LINCOLN:
1982-2001 TOWN CAR
2000-2001 LS
1998-2001 NAVIGATOR
MERCURY:
1980-2001 GRAND MARQUIS
1987-1997 COUGAR
1997-2002 MOUNTAINEER
This TSB article is being republished in its entirety to update model applications and model years.
ISSUE:
Contamination from prior transmission concerns or excess wear may be trapped in the transmission fluid cooling system. This debris must be removed by properly cleaning the transmission cooling system. After cleaning, some contamination may still remain. The remaining contamination may be reintroduced into the fluid cooling system of a repaired/replaced transmission causing premature or repeat failures.
ACTION:
After every overhaul or transmission exchange, clean, flush and backflush the transmission fluid cooling system which includes: fluid cooler, auxiliary cooler, cooler lines, and Cooler Bypass Valve (CBV), if equipped. Perform the cooler flow test to ensure proper transmission fluid flow volume on the transmission return line through the cooling system. Once proper fluid flow volume is verified install the Transmission Fluid In-Line Filter Kit (XC3Z-7B155-AA) in the fluid cooler return line (transmission fluid flow coming out of the fluid cooler going into the transmission). Refer to the following Service Procedure for details.
SERVICE PROCEDURE
NOTE: THIS IN-LINE TRANSMISSION FLUID FILTER KIT CAN BE INSTALLED ON ALL TRANSMISSIONS WITH 8mm (5/16") AND 9.5mm (3/8") TRANSMISSION FLUID COOLER LINES.
NOTE: THIS IN-LINE TRANSMISSION FLUID FILTER KIT WILL ALSO BE SUPPLIED WITH ALL E4OD/4R100 AND OTHER FORD QUALITY REMANUFACTURED (FQR) TRANSMISSIONS. AFTER ANY OVERHAUL OR TRANSMISSION EXCHANGE PRIOR TO CONNECTING THE TRANSMISSION FLUID COOLING SYSTEM TO THE TRANSMISSION, FOLLOW THE STEPS BELOW.
1. Clean, flush and backflush transmission fluid cooling system.
NOTE: