Expedition 4WD V8-281 4.6L SOHC (1998)
Output Shaft: All Technical Service Bulletins
MIL ON/DTC P0503/Erratic Speedometer/Shifting
Article No.
98-5-8
03/16/98
^
LAMP - MALFUNCTION INDICATOR LAMP (MIL)
ILLUMINATED - DIAGNOSTIC TROUBLE CODE
(DTC) P0503 STORED IN MEMORY - 4X4 VEHICLES
ONLY
^
TRANSMISSION - SHIFT CONCERNS AND/OR
ERRATIC SPEEDOMETER OPERATION -
MALFUNCTION INDICATOR LAMP (MIL)
ILLUMINATED - 4X4 VEHICLES ONLY
LIGHT TRUCK:
1997-98 EXPEDITION, F-150, F-250 LD
1998 NAVIGATOR
This TSB article is being republished in its entirety to correct the parts listed.
ISSUE:
The Malfunction Indicator Lamp (MIL) may illuminate and Diagnostic Trouble Code (DTC) P0503 may be stored in memory. There may also be
transmission shift concerns and/or erratic speedometer operation. This may be caused by the speedometer drive gear being loose on the transfer case
output shaft.
ACTION:
Replace the speedometer drive gear. The new gear has a tighter fit and should reduce the possibility of erratic signals. Refer to the following Service
Procedure for details.
SERVICE PROCEDURE
1.
Perform normal diagnostics as outlined in the 1997 or 1998 Powertrain Control/Emissions Diagnosis (PC/ED) On-Board Diagnostics II (OBDII)
Service Manual. Service as required.
2.
If no concerns were found or the concern is still present, replace the speedometer drive gear.
3.
Remove the four (4) rear driveshaft flange bolts and remove the rear driveshaft.
NOTE:
TO MAINTAIN INITIAL DRIVESHAFT BALANCE, MARK THE REAR DRIVESHAFT YOKE AND AXLE FLANGE SO THEY CAN BE
REASSEMBLED IN THEIR ORIGINAL POSITIONS.
4.
Remove the six (6) extension housing bolts and remove the rear extension housing.
5.
Remove the speedometer gear spacer then push the speedometer drive gear toward the transfer case and remove the steel ball. The speedometer
drive gear can now be removed from the output shaft.
6.
To install the revised Speedometer Drive Gear (F7TZ-17285-AA), reverse the removal procedure.
NOTE:
THE NEW SPEEDOMETER DRIVE GEAR WILL HAVE A SLIGHT INTERFERENCE FIT, HOWEVER IT WILL GO ON TO THE OUTPUT
SHAFT BY HAND. DO NOT HEAT THE GEAR.
7.
Before installing the extension housing, apply a small bead of sealant to the transfer case cover and extension housing mating surfaces. Use Ford
Ultra Silicone Sealant (F7TZ-19554-AA or equivalent).
8.
Top off transfer case with MERCON® (XT-2-QDX).
PART NUMBER
PART NAME
F7IZ-19554-AA
Ultra Silicone Sealant
F7TZ-17285-AA
Speedometer Drive Gear
