Inside the Original Jeep Quadra-Trac
The vacuum shifter (A) receives engine vacuum from a glovebox-mounted vacuum switch labeled “Emergency Drive.” Rotating the switch applies vacuum to one of two nipples on the shifter, causing the rod to move in or out. The attached fork (B) slides a collar on the output shaft, which locks the center differential. The control diaphragm is no longer available from Jeep, but both Crown Automotive and MileMarker stock them. View Related Article
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