Fulltext TSBs

Technical Service Bulletins

TSB
97-11-11
  • TRANSMISSION – 4R70W – ERRATIC OR PROLONGED 1-2 SHIFT
  • TRANSMISSION – AODE – ERRATIC OR PROLONGED 1-2 SHIFT
Publication Date: MAY 27, 1997

FORD:
1992-1997 CROWN VICTORIA
1994-1997 MUSTANG, THUNDERBIRD
LINCOLN-MERCURY:
1992-1997 GRAND MARQUIS, TOWN CAR
1993-1997 MARK VIII
1994-1997 COUGAR
LIGHT TRUCK:
1994-1997 ECONOLINE, F-150
1996-1997 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.


    Figure 1 – Article 97-11-11

  4. Reinstall the retaining ring.

    NOTE:DO NOT REUSE THE TRANSMISSION PAN GASKET IF IT IS DAMAGED.

  5. Install the transmission pan and gasket.

PART NUMBERPART NAME
F7AZ-7F251-AAPiston/Seal Assembly
F3LY-7F284-AAccumulator Spring – Bottom
F4UZ-7F284-AAccumulator Spring – Bottom
F7AZ-7F284-BAAccumulator Spring – Bottom
F7AZ-7F284-AAAccumulator Spring – Top
F7AZ-7F284-CAAccumulator Spring – Top
F75Z-7F284-AAAccumulator Spring – Top
F75Z-7F284-BAAccumulator Spring – Top

OTHER APPLICABLE ARTICLES:

NONE

WARRANTY STATUS:

Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATIONDESCRIPTIONTIME
971111AReplace 1-2 Accumulator Components As Required (Includes Pan Removal And Installation) – All Vehicles0.9 Hr.
971111BAdd Time To Clean, Inspect And Reuse Pan Gasket0.1 Hr.
971111CPost Repair Road Test0.3 Hr.

DEALER CODING

BASIC PART NO.CONDITION CODE
7F24970

OASIS CODES:

501000, 502000, 503000, 504000, 590000


Copyright 1997 Ford Motor Company