What would cause the mercedes sprinter diff noise?

There are a few different things that would cause differential noise in the Mercedes-Benz Sprinter, and the cause is usually dependent on exactly how it sounds. You might be able to describe the sound as "whirring", "whining", "rumbling", "clunking", or "clicking", and they each have a few different problems that can cause it. First, a whirring noise while decelerating is usually caused by failing pinion bearings or a loose pinion bearing preload. Whirring can also be caused by worn carrier bearings. If it's whining during acceleration, You likely have a worn sing and pinion gears, or an improper gear setup. Clunking can mean a broken ring or pinion gear tooth, as can clicking. Finally, You may also have loose yokes, bad u-joints, or a worn transfer case if You're experiencing clunking or clicking, especially when firSTStarting out from a top.