Why does my transfer case make noise while driving?
Why does my transfer case make noise while driving? The transfer case could be low on fluid or have worn interior components. Shift through all the transmission gears while test driving the truck. If there is a noise while the truck is in neutral, or in some gears but not others, remove and repair the transmission. Check transfer case fluid level. Why does my Ford F-150 make a humming noise? Replace if needed. If there is a howl or humming noise coming from the transfer case in all ranges or 4H only, the gears in your transfer case might be...