I just bought a 1998 4 door blazer with 125K on it last week. The Rear end makes a low humming noise when i go over like 60MPH. Mostly when I step on the gas. Any ideas what it could be. I was thinking it might need to be rebuilt. Hopefully not. Any info would be greatly appreciated. Thanks

Eric

 

Could just be an outer wheel bearing. If you jack up the rear end, can you feel play in the axle up/down?