I have a 2000 GMC jimmy. when driving in 2 wh. dr.(2Hi) there is a loud clicking which gets faster with speed. When I switch to 4 wheel dr. (4Hi) the noise goes away, although you can still hear a hum like driving over a rough road. Do you know what this could be?
My check 4wd comes on and off while driving also all of the light on the panel 4 w high , low 2 w ???
what can this be ?
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it turned out to be the transfer case switch.
i have no vacume to the actuator any ideals on the problem thanks
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