Grinding Noise while Driving

[CLansdale]

My 1999 Grand Cherokee Laredo recently started making a loud metal on metal grinding noise. It started after my wife stopped at a red-light and started going again once it hit green, the only other noises it previously made was a light "rattle" at low speeds. I've changed the brake pads a few months ago but nothing was wrong with the calipers or rotors so I didn't mess with them. The grind doesn't happen in idle, only when the vehicle is moving, regardless of speed. Any help you could give would be greatly appreciated.

[NastyNateNE1469]

The grinding noise is a typical jeep noise, mine does the same thing! I hate it! The problem is usually the pinion bearing in the rearend, its $70 for all the parts and about 3 hours labor, I wouldn't recommend doing it yourself unless you have some very extensive micrometers

[goldjeep99]

If it is 4X4 you may want to check the CV-joint in front driveshaft. Check if it has the rubber protecting the bearing. If it is not there, you need to inspect it and maybe replace it. I found that to be my problem.
Regards,
Gold.

[Goldfishy]

If the sound is constant, only when moving and if you shift briefly into neutral and still there, it may be your wheel bearings, see my previous thread.

http://www.automotiveforums.com/vbul...d.php?t=461047

The 99's are getting of age for this problem.