Take it for a drive and switch it in/out of 4X4 a few dozen times. That might free up the sticky vacuum switch to the front axle. What your likely hearing is the collar on the axle interlock almost engaging and grinding. If that doesn't free it up you can spray a bit of silicon into the vacuum lines and let it set a while to soak into the various valves. Then cycle it some more and see what you have.
Wednesday, June 17th, 2009 AT 12:54 PM