Grinding noise from front wheels at all speeds.

SOURCE: 2002 Grand Cherokee Limited, 104,000 miles

That would most likely be your bearing, the average for a bearing is about 80,000 miles, i would get it replaced asap, i once had a bad bearing in a vw, thought it would just stop the tire from rotating when it completely broke, i was wrong, driving down the highway the whole drum, rim, and tire came off as i was going about 55-65mph, and because the drum was attached to the run-away-wheel when it disconnected, the brake shoes had nothing to press against, so when it came off, first thing i did was (poop my pants.... almost) hit the brakes, which did nothing, the car just slowed down as if the brakes we just barley being applied, eventually, it stopped, i got out to find the brake fluid was on fire do to the heat/sparks put off by the friction, and braked fluid is very hard to extinguish, a full 20oz. bottle of water didnt do nearly as much as i thought it would, called 911, and by the time the fire department was done with it, everything from the dash board to the back bymper was totaled, and never found my drum/rim/tire. so i would get all your bearings replaced, if one is just starting to give you problems, its only a matter of time before the other ones **** out on ya.

SOURCE: GRINDING NOISE ON THE DRIVER FRONT WHEEL REPLACED

get and stetoscop,or screwdriver a long one,suspend the car on jack,and do and inspection side by side,sometimes noise tend to confuses us