Dont know if it is vaccum. I do know there is an electric shift motor on the transfer case. The light comes on and it goes in 4wd. If he doesnt do this it does not go in and the light does not come on. He also said the 4wd dash lights dont come on anymore when you start it.
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91 fj 80 on 37 Nitto Muds with a 10k winch. Cage and sliders coming soon.
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