A/T - AODE/4R70W Erratic/Prolonged 1-2 Shift
Article No.97-11-11
05/27/97
^ TRANSMISSION - 4R70W - ERRATIC OR
PROLONGED 1-2 SHIFT
^ TRANSMISSION - AODE - ERRATIC OR
PROLONGED 1-2 SHIFT
FORD:
1992-97 CROWN VICTORIA
1994-97 MUSTANG, THUNDERBIRD
LINCOLN-MERCURY:
1992-97 GRAND MARQUIS, TOWN CAR
1993-97 MARK VIII
1994-97 COUGAR
LIGHT TRUCK:
1994-97 ECONOLINE, F-150
1996-97 EXPLORER
1997 EXPEDITION, MOUNTAINEER
ISSUE:
Some vehicles may exhibit an erratic or prolonged 1-2 shift. This may be caused by early Accumulator Seal wear which may occur during repeated 1-2, 2-1 shift cycling. The Accumulator side loads in the Case Accumulator Bore and causes the Case Bore to become scuffed. Bore scuffing leads to premature seal wear and eventual intermediate clutch pressure loss, which leads to the loss in 1-2 shift.
ACTION:
Replace the cast aluminum piston with the one-piece stamped steel piston with bonded lip seals and replace the top Accumulator Spring. These revised parts allow for increased durability. Refer to the following Service Procedure for details.
SERVICE PROCEDURE
NOTE:
TRANSMISSION CASE REPLACEMENT IS NOT REQUIRED DUE TO 1-2 SHIFT ACCUMULATOR BORE SCUFFING. THE REVISED PISTON ASSEMBLY CAN BE USED WITH SCUFFED SEAL BORE.
1. With the vehicle on a hoist, remove the transmission pan and gasket. Using the Snap Ring Removal Tool, remove the 1-2 Accumulator Piston Retainer. At this time, the spring load will pop the cover and bottom Accumulator Spring out of the bore.
2. Remove the piston and top Accumulator Spring.
3. Replace the piston and top Accumulator Spring with the new bonded Piston (F7AZ-7F251-AA) and spring (refer to Figure 1 for applications). If not damaged, reinstall the bottom Accumulator Spring and cover.
4. Reinstall the retaining ring.
NOTE:
DO NOT REUSE THE TRANSMISSION PAN GASKET IF IT IS DAMAGED.
5. Install the transmission pan and gasket.
Parts Block
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME
971111A Replace 1-2 Accumulator 0.9 Hr.
Components As Required
(Includes Pan Removal
And Installation) - All
Vehicles
971111B Add Time To Clean, 0.1 Hr.
Inspect And Reuse Pan
Gasket
971111C Post Repair Road Test 0.3 Hr.
DEALER CODING
CONDITION
BASIC PART NO. CODE
7F249 70
OASIS CODES: 501000, 502000, 503000, 504000, 590000