Pwm And Non-Pwm Oil Pump Differences - ATSG FORD 4R100 Manual

CHANGE:
Beginning at the start of production in 1999, the 4R100 transmission was offered with two
different torque converter clutch application strategies. A "PWM" (Pulse Width Modulated)
version, was added for V-10 gas powered vehicles and all diesels, and a "NON-PWM" version,
offered in all other gas powered vehicles. This required two different solenoid packs as well as two
different pump assemblies.
REASON: For smooth converter clutch apply on V-10 gas and diesel engine models.
PARTS AFFECTED:
(1)
PUMP ASSEMBLY:
The pump cover assembly had the rear of the Converter Clutch Valve bore enlarged approximately
•
.070" to accommodate the enlarged land of the Converter Clutch Valve as shown in Figure 36.
A .036" orifice and an air bleed were added to the TCC Solenoid signal passage as shown in Figure
38.
•
The Converter Clutch Control Valve's rear spool was enlarged approximately .070." There was
also a bushing and valve added to the end of the valve train as shown in Figure 36.
•
A hole was added to the pump cover to connect the Converter Clutch Control Valve Bushing to
Converter Regulator Valve oil, as shown in Figure 38.
•
The Converter release orifice in the NON-PWM pump cover, as shown in Figure 37, was removed
from the PWM pump cover as shown in Figure 38.
•
THE SOLENOID PACK:
The PWM solenoid pack requires a Pulse Width Modulated torque converter clutch solenoid and
(2)
the NON-PWM solenoid pack requires an on-off torque converter clutch solenoid.
•
INTERCHANGABILITY:
None of the parts listed above are interchangable from model to model.
SERVICE INFORMATION:
"NON-PWM" Pump assy. (with "Cast Iron" coast clutch drum).................F81Z-7A103-AA
"NON-PWM" Pump assy. (with "Stamped Steel" coast clutch drum)..........F81Z-7A103-BA
"PWM" Pump assy. (with "Stamped Steel" coast clutch drum)....................F81Z-7A103-CA
"NON-PWM" Solenoid Pack...........................................................................F81Z-7G391-BA
"PWM" Solenoid Pack.....................................................................................F81Z-7G391-AB
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Technical Service Information
FORD 4R100
"PWM" AND "NON-PWM"
PUMP DIFFERENCES
AUTOMATIC TRANSMISSION SERVICE GROUP
Copyright © 2003 ATSG