deltafrat87

I've got a '05 4dr Explorer (100K) and have noticed a humming noise coming from what appears to be the left rear wheel. As I turn the steering to the right, the sound is more pronounced. As I turn to the left, it seems to dissipate somewhat. Any ideas on this grinding noise ? Thanks !

360ci

If the sound increases with speed then it could be a bearing. Best way to check is to lift the tire a few inches off the ground and place a hand on the bottom and the other on the top. If you can wobble or shake the wheel and there is even a little bit of play, that bearing is shot as the wheel/tire shouldn't move at all.

Worst case is that it's the axle. If you haven't had the differential fluid replaced in the last 40-50K miles along with getting the magnet cleaned - get it done.

Be careful though, as some shops will suck out the old fluid and replace the fluid leaving the crap sitting in the bottom of the differential. Only way to do a proper fluid change is to remove the cover, clean out the old fluid with a lint free cloth and wipe off the magnet. This also allows you to inspect the gears for damage. Then replace the cover using RTV sealant, wait half hour then add fresh fluid and away you go.

__________________
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!

deltafrat87

Thanks.. I'll look into checking the wheel for movement.. I pulled the tire and inspected the where the bearing would seed. A buddy told me that if an bearing is going, it would show some signs of throwing grease.. I did not see this at all.

jwko

Have you checked the fluid level in the differential?

Yes most usually, when the bearing fails, the seal will also fail.

cowcar0

I just had the seals replaced in the differential and all of the bearing replaced on my 2002 Explorer. I heard a loud humming for a long time and I was told it was just my tires that were loud. Then a loud clunk would happen when I accelarated. So my boyfriend drove it and figured out what was wrong. My bearings were shot!! Since everything was replaced I have not had ANY noise problems. If you are able to replace the bearings yourself, it will be a lot cheaper!