Everytime i get up to around 30-35mph there is a humming noise coming from the rear section of my jeep, could it be that the rear needs fluid or something?..

thanks, jmart

 

couldnt hurt to check the fluid level/condition. while u've got the cover off inspect for any metal shavings or anything like that.

also possible that its a wheel bearing going out, so at 30-35 mph steer side to side to shift weight from one side of the vehicle to the other; if the noise fluctuates while you do that, its probably gonna be one of the rear bearings going out.
also inspect your rear tire tread for "stair-stepping", or "scallopping/chopping".

have the tires been rotated recently? if you just rotated the tires and havent done an alignment in a long time, its possible the front tires had some funky wear on them and then got rotated to the back.

 

some guys were saying it might be a pinion bearing..it that possible?

 

it is possible, but i would check all the other stuff out first, especially diff fluid level/condition . if you went mudding and got water into your diff, all the bearings in there will be pi$$ed.

 

Let me guess. It gets louder when you coast right? If it does, you need new gears. There isn't enough backlash. Whomever did your rear end failed.

 

mine started '' humming'' coming down hills..........$1500 new rear end fixed that problem