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I haven't seen one on a '98 Jimmy, but I have a '96 Jimmy and they are probably the same. It is circular, about 3 to 3 and 1/2 inches in diameter and about 1 and 1/2 inches thick. In order to get to it, you have to remove the battery and then remove the battery tray. You will find the actuator hiding underneath the battery tray. Best of luck, Paul H.

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Q: What does the 4wd vacuum actuator look like on a 1998 gmc jimmy?
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