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08-07-93 Rev. A

Speed Control Surge

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Models: 1992 - 1993 (AD) Ram Pickup/Ram Cab Chassis

NOTE: THIS BULLETIN APPLIES ONLY TO FOUR WHEEL DRIVE VEHICLES EQUIPPED WITH THE CUMMINS DIESEL ENGINE.

Symptom/Condition:

Some vehicles may exhibit a speed variation at highway speeds while the speed control is engaged.

Diagnosis:

1. Perform the speed control system test as outlined in Section 8H of the service manual. If no problems are found during the test, proceed to step 2.

2. On 1992 vehicles verify that the vehicle is equipped with the correct speed control servo and cable for the Powertrain Control Module (SBEC) that is installed. Refer to the chart below and make sure that the Powertrain Control Module, servo and cable match.

POWERTRAIN CONTROL MODULE REFERENCE CHART
SBEC Part No.	Servo Part No.	Cable Part No.
56027570	53007954 (Zemco)	4428787
56027571	53007954 (Zemco)	4428787
56027572	53007954 (Zemco)	4428787
56027573	53007954 (Zemco)	4428787
56027081	53009315 (Eaton)	52078330
56027082	53009315 (Eaton)	52078330
56027083	53009315 (Eaton)	52078330
56027084	53009315 (Eaton)	52078330

3. If no problems have been found to this point, the speedometer drive gear on the output shaft of the NP 205 transfer case may be at fault. Remove the speed sensor, adapter and the speedometer drive gear. Carefully inspect the speedometer drive gear while rotating the output shaft. Any cuts or irregularities on the gear can cause a speed sensor signal variation. If any irregularities are present, proceed to the repair procedure.

Parts Required:

1    Speedometer Drive Gear    3732038

Repair Procedure:

Replace the speedometer drive gear using the procedures outlined in Section 21 of the Rear Wheel Drive Dodge Truck Service Manual.

Notes:

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:
Labor Operation No. 21-97-10-91 . . . . . . . . 0.6 Hrs.

FAILURE CODE:   58 - Internal Defect