FORD 4R100 - "PWM" AND "NON-PWM" PUMP DIFFERENCES

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 in V-10 gas powered vehicles and all diesel, and a "NON-PWM" version, offered in all other gas powered vehicles. Hot car diagnostic tool to konw?  This required two different solenoid packs as well as two different pump assemblies.

REASON: For smooth converter 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 acommodate the enlarged land of the Converter Clutch Valve.
A .036" orifice and an air bleed were added to the TCC Solenoid signal passage.

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.
A hole was added to the pump cover to connect the Converter Clutch Control Valve Bushing to Converter Regulator Valve oil.
    
The Converter release orifice in the NON-PWM pump cover, as shown in Figure 1, was removed from the PWM pump cover.

The PWM solenoid pack requires a Pulse Width Modulated torque converter clutch solenoid and the NON-PWM solenoid pack requires an on-off torque converter clutch solenoid. You also can get some car tools like BMW M35080 and memoscan u581 to know more.

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