Bronco II 2WD V6-177 2.9L (1986)
Valve Body: Customer Interest
A/T - A4LD Engine RPM Increases On Downshift
TRANSMISSION - A4LD - 2.3L, 2.9L, 3.0L -
Article No.
ENGINE RPM INCREASES ON DOWNSHIFT -
87-5-22
TRANSMISSIONS BUILT BETWEEN 07/30/86 AND 10/01/86
FORD 1987 MUSTANG
LIGHT TRUCK 1986-87 RANGER, BRONCO II, AEROSTAR
Figure 29
ISSUE:
An increase of approximately 1000 engine RPM when downshifting to 2nd gear in Drive or Overdrive during a 3-2 or 4-2 downshift may be
caused by a mispositioned channel in the #214 (3-2 kickdown timing valve) bore of the main control casting (see Figure 29). This condition
usually occurs within a narrow 3 mph/5 km/h range at a normal speed of 38 mph/61 km/h depending upon axle ratio and tire size.
ACTION:
To correct this, install a new service valve, E7TZ-7D054-A, using the following service procedure.
1.
Confirm that increase in engine RPM occurs on downshift by road testing the vehicle.
2.
If the transmission build date falls within the July 30-October 1, 1986 time period, remove oil pan to determine casting supplier
code, casting date and cavity number (Figure 29).
3.
If the main control has the matching identification specified in Figure 29 (Supplier Code 1-7010-D, Cavity No. 1, Build Date
30th Week '86 through 39th Week '86 and Part No. P86GT-7A101-AAR), remove main control using the procedure in Section
17 of the appropriate Shop Manual and repair as follows:
^
Locate bore #214 using the appropriate Shop Manual.
^
Remove separator plate, gasket, retainer, spring and valve from bore #214. Discard the original valve, but save the other
parts for reassembly.
^
Install new service valve, E7TZ-7D054-A, and reinstall spring, retainer, gasket and separator plate.
