CHRYSLER A904 - SURGING BETWEEN 35-55 MPH

This bulletin supersedes Technical Service Bulletin 18-55-86, whick should be removed from your files. This repair only applies to subject vehicles equipped with a Federal Emission Package. It does not apply to 5.2L 2BBL heavy duty engines (identified by~a~ "4" in the eighth [engine] character of the VIN. Find more useful tools like ak400 and vas 5052?

SYMPTOM/CONDITION
Vehicle may exhibit a surge between steady speeds of 35 and 55 mph, with engine at full operating temperature.

DIAGNOSIS
Road test the vehicle at a steady speed between 35 and 55 mph to verify surge condition. Engine must be at full operating temperature. The surge normally is worse just after transmission lockup engagement.

PARTS REQUIRED
Drive Package PN 4419440 Consists of:
1 ESA/EFC Module                                            PN 4379255
1 6.2? Transmission Lock-Up Spring                                 PN 4202672
1 Transmission Pan Gasket                                        PN 4295875
1 Authorized Modification Label                                   PN 4275086

REPAIR PROCEDURE
This repair involves replacement of the transmission lock-up spring and a revised ESA/EFC module. The lock up speed will be raised from approximately 43 mph to 53 mph. And if you have cars, you can find some obd2 scanner to konw more about auto repair and car maintenance.

1. Raise vehicle on hoist, remove shift linkage and kickdown linkage, drain transmission fluid, and remove transmission pan.
2. Lower valve body just enough to remove torque converter lock-up spring, replace with supplied spring, PN 4202672. Re-use the existing lock-up valve, fail safe valve and spring, cover, and screws (Figure 1).
3. Reinstall valve body and torque screws to 100 inch pounds.
4. Reinstall transmission oil pan using supplied gasket, PN 4295875. Reconnect shift and kickdown linkage. Lower vehicle and refill using transmission fluid, PN 4318077. Adjust shift and kickdown linkages per the service manual procedures.
5. Remove ESA and replace with supplied ESA, PN 4379255.
6. Type Authorized Modification Label, PN 4275086, as shown in Figure 2 and attach near VECI label.