A/T - APOD No Forward after Coast Down From 4th Gear
TSB 85-35SUBJECT: AOD NO FORWARD
TRANSMISSION - AUTOMATIC -
AOD - NO FORWARD DRIVE
AFTER COAST DOWN FROM
FOURTH GEAR
FORD
1983-1985 FORD, THUNDERBIRD, LTD,
MUSTANG
LINCOLN-MERCURY
1983-85 MERCURY, COUGAR, MARQUIS, CAPRI, LINCOLN, MARK, CONTINENTAL
LIGHT TRUCK
1983-85 E & F SERIES
Some AOD-equipped vehicles with transmissions built between March, 1983 and April 19, 1985 may exhibit a no forward drive condition after coast down from fourth gear. This condition may occur if a small particle of contamination causes the 34 shift valve to stick in the forward clutch exhaust position.
To service this condition, install a new 3-4 shift valve that has a design with flats on the valve. This will allow contamination to pass and be trapped in the main control filter assembly. The new valve was incorporated in production April 19, 1985. Refer to Figure 1 for visual differences between 3-4 shift valve design levels.
PART NUMBER PART NAME
E5AZ-7F259-A 3-4 Shift valve