Cruise Control Servo Cable: Description and Operation

SPEED CONTROL SERVO CABLE
The speed control servo cable is connected between the speed control vacuum servo diaphragm and the throttle body control linkage. This cable is used with 3.7L/4.7L/5.9L/8.0L gas powered engines only. It is also used if equipped with a 5.9L diesel engine equipped with an automatic transmission.

A speed control servo cable is not used if equipped with either a 5.9L diesel engine equipped with a manual transmission, or any 5.7L engine/transmission combinations.

This cable causes the throttle control linkage to open or close the throttle valve in response to movement of the vacuum servo diaphragm.