Humming noise

Humming noise

Postby SafariRulez [OP] » March 18th 2013, 2:59pm

You probably heard this a million times!

I'm getting a humming noise in the rear end when I go 100 + king, even in neutral.
I changed the rear wheel bears and put new diff fluid in. The noise is still there! What the heck can it be?

Thanks for your help
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Re: Humming noise

Postby SafariRulez [OP] » March 18th 2013, 3:14pm

King = Km/h
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Re: Humming noise

Postby RECox286 » March 18th 2013, 5:38pm

Not enough information, please say what tune it hums... Or hold the phone closer to it while you are driving !

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Re: Humming noise

Postby RECox286 » March 18th 2013, 6:00pm

Does the hum intesify with speed; less at lower speed, more at highter speed ? Did you check the axles for wear at the spots

where the axle bearings touch the axles ? If there were bad spots on the axle, did you 1) R&R axles, or 2) use offset axle bearings ?

What did you use for gear lube ? (Inquiring minds would like to know.)

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NOTE: The 10 bolt axle is a semi floating type. This means that the outer part of the axle is held in the center of the

axle tube by the axle bearing, and the axle itself becomes the inner race. Not the best of designs, but it does

accomplish the job. However, and mostly due to lack of lubrication, the bearing/axle can and does heat up,

destroying one another. It is usually a good idea to use wheel bearing grease, to pack the axle/bearing/seal

when reassembling after bearing replacement. Once the axle is scored by the bearing, it was once a given that

the axle needed to be replaced. More recently, there is an offset bearing available that moves the rollers to a

fresh spot on the axle, eliminating the need for axle replacement until such time that the axle becomes scored

on the "new" bearing surface.
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Re: Humming noise

Postby SafariRulez [OP] » March 18th 2013, 8:10pm

Is a low pitch hum and it gets louder when you drive faster
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Re: Humming noise

Postby chevymaher » March 18th 2013, 8:27pm

The majority of rear ends do hum. Vans just have the disadvantage of having a sound amplification system built in. And the rear of the van has good acoustical value. And due to the back not having sound insulation. Such as a back seat. Rear end gears meshing has a sound even when nothing is wrong.

The difference is. Is it a normal good sound or a I am wore out growl sound.

My vans rear end was wasted bearings and gears. It was growling.
I used all performance parts rebuilding it. Now it sounds exactly like the chevelles rear end. Nothing like it sounded before. But even new it had a sound.
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Re: Humming noise

Postby Don1806 » March 18th 2013, 8:36pm

Don't rule out tire noise unless you have a brand new set on the rear. I have chased noises on my van and my car only to find out they went away when I replaced the tires. It will drive you nuts.
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Re: Humming noise

Postby xit » March 18th 2013, 8:56pm

Mine had a little noise before I put on new tires & it went away just like that. :D
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Re: Humming noise

Postby SafariRulez [OP] » March 18th 2013, 11:01pm

The thing is one day I was driving and I hit a pot hole. Soon after I heard crackling and almost like a set of keys dragging on the floor, coming from the rear end. I stopped the truck and looked underneath but didn't notice anything unusual. And then soon after that I noticed some roaring coming from the rear end when I got onto the hwy. That's why I thought to change the rear wheel bearing and diff fluid.
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Re: Humming noise

Postby chevymaher » March 19th 2013, 12:36am

Now it makes sense. Check for a bent axle.
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