Focus ZTS L4-2.0L DOHC VIN 3 (2001)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
A/T - Reprogram PCM After Installing Revised Transaxle
Article No.
01-25-4
12/24/01
TRANSAXLE - 4F27E - FINAL DRIVE GEARSET RATIO
CHANGE - DELAYED SHIFTS AFTER FINAL DRIVE
GEARSET RATIO CHANGE OR TRANSAXLE
REPLACEMENT
FORD:
2000-2001 FOCUS
ISSUE
When REBUILDING a transmission with an older gear ratio, and installing a new final drive input and transfer shaft input gear set, an upgrade to the
Powertrain Control Module (PCM) calibration is necessary.
When REPLACING a transmission with a transmission containing an upgraded gearset an upgrade to the PCM calibration is needed.
ACTION
An internal gear change took place to the 4F27E automatic transaxle during the month of December 2000. The number of teeth on the final drive input
gear and the transfer shaft input gear were changed, and a new calibration is available to match the new gear ratio. If a change is made to the gear ratio, a
calibration change is necessary or the vehicle may exhibit delayed shifts. Refer to the following Service Procedure for details.
SERVICE PROCEDURE
Verify that the vehicle has the old gear ratio. If the vehicle's transaxle has a part number that starts with an X (ex: XS4P) it contains the older gear set.
Transaxles with part numbers that begin with 1 (ex: 1S4P) have the new gear set. The old final drive input gear had 87 teeth and the old transfer shaft
input gear had 83 teeth. The new final drive input gear has 59 teeth and the new transfer shaft input gear has 57 teeth.
^
When REBUILDING a transaxle with a new gear ratio, follow the Workshop Manual procedures to replace the final drive input gear and the transfer
shaft input gear assembly. Then reassemble and reprogram the vehicle's PCM to reflect the new gear ratio.
^
When REPLACING the transaxle assembly follow the Workshop Manual procedures and reprogram the vehicle's PCM to reflect the new gear ratio.
