While going down the road, anywhere from 40 to 70 mph there is a loud humming noise from above the rear axle. It sounds as if I have an F150 with humongous monster mud tires on it. It's that same sound when you hear one of those big knobby tire guys going down the freeway.Any ideas? If I let off the gas it quiets down, but holding it at speed or accelerating is when it does it.I thought tires, but then though my other Class A with dually tires on the back didn't make that noise. Tires are brand new, and it did this sound before and after new tires anyway.It's a Ford F53 Chassis, 1995, 35 footer. I have not checked differential fluid yet.

you need to put a bearing kit in your rear-end.you either got a bad/pitted bearing or a burn race.did the rear end get hot or water in it

the pinion shaft bearings maybe. If you ran it to long with no oil it wont go away when you fill it.

Need your diffy serviced, perhaps rebuilt.

record the sound and send us a wave file.nehuge wrote:While going down the road, anywhere from 4to 70 mph there is a loud humming noise from above the rear axle. It sounds as if I have an F150 with humongous monster mud tires on it. It's that same sound when you hear one of those big knobby tire guys going down the freeway.Any ideas? If I let off the gas it quiets down, but holding it at speed or accelerating is when it does it.I thought tires, but then though my other Class A with dually tires on the back didn't make that noise. Tires are brand new, and it did this sound before and after new tires anyway.It's a Ford F53 Chassis, 1995, 35 footer. I have not checked differential fluid yet.

nehuge wrote:While going down the road, anywhere from 40 to 70 mph there is a loud humming noise from above the rear axle. It sounds as if I have an F150 with humongous monster mud tires on it. It's that same sound when you hear one of those big knobby tire guys going down the freeway.Any ideas? If I let off the gas it quiets down, but holding it at speed or accelerating is when it does it.I thought tires, but then though my other Class A with dually tires on the back didn't make that noise. Tires are brand new, and it did this sound before and after new tires anyway.It's a Ford F53 Chassis, 1995, 35 footer. I have not checked differential fluid yet.It sounds to me like your ring, and pinion are worn on the "drive" side, as it stops when you let off. And as long as it is pulling or holding speed it roars. In other words, when the "drive" side is working. It makes noise.Easy fix really. New ring, and pinion. Less expensive than you think

Rear end noise, anybody know what this is? | Good Sam Community

15 Replies

Terryallan
Explorer II
May 01, 2013
nehuge wrote:
While going down the road, anywhere from 40 to 70 mph there is a loud humming noise from above the rear axle. It sounds as if I have an F150 with humongous monster mud tires on it. It's that same sound when you hear one of those big knobby tire guys going down the freeway.

Any ideas? If I let off the gas it quiets down, but holding it at speed or accelerating is when it does it.

I thought tires, but then though my other Class A with dually tires on the back didn't make that noise. Tires are brand new, and it did this sound before and after new tires anyway.

It's a Ford F53 Chassis, 1995, 35 footer. I have not checked differential fluid yet.

It sounds to me like your ring, and pinion are worn on the "drive" side, as it stops when you let off. And as long as it is pulling or holding speed it roars. In other words, when the "drive" side is working. It makes noise.

Easy fix really. New ring, and pinion. Less expensive than you think
wallynm
Explorer
Apr 30, 2013
record the sound and send us a wave file.

nehuge wrote:
While going down the road, anywhere from 4to 70 mph there is a loud humming noise from above the rear axle. It sounds as if I have an F150 with humongous monster mud tires on it. It's that same sound when you hear one of those big knobby tire guys going down the freeway.

Any ideas? If I let off the gas it quiets down, but holding it at speed or accelerating is when it does it.

I thought tires, but then though my other Class A with dually tires on the back didn't make that noise. Tires are brand new, and it did this sound before and after new tires anyway.

It's a Ford F53 Chassis, 1995, 35 footer. I have not checked differential fluid yet.
2oldman
Explorer II
Apr 30, 2013
Need your diffy serviced, perhaps rebuilt.
K_Charles
Explorer
Apr 30, 2013
the pinion shaft bearings maybe. If you ran it to long with no oil it wont go away when you fill it.
Mark_Heisler
Explorer II
Apr 30, 2013
you need to put a bearing kit in your rear-end.you either got a bad/pitted bearing or a burn race.did the rear end get hot or water in it

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Rear end noise, anybody know what this is?

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