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Does a Dodge Ram 1500 4X4 have vacuum modulator or valve?

No, a modern Dodge Ram 1500 4x4 (generally referring to models from the past 15-20 years) does not use a vacuum modulator or valve in its transfer case for engaging 4WD. Older models might have, but current systems use electronically controlled actuators. The engagement of 4WD is controlled by electronic signals and motors, not vacuum.
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