Rear-end Noise
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Pro
Joined: Nov 2009
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From: Maple Grove Minnesota
Rear-end Noise
I’m hearing a low pitch humming/rubbing noise in the rear-end, hard to say what it sounds like. It doesn’t make noise at first just after driving a while. Any ideas?
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Joined: Aug 2007
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From: Livonia Michigan
Pro
Joined: Jun 2008
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In addition to what's already been suggested:
Find a smooth stretch of level road and see what happens under the conditions of gentle acceleration, deceleration, and coast.
The object is to observe the noise as you load the differential from both directions and also with no load on it.
Also note if cornering or braking have any effect.
Find a smooth stretch of level road and see what happens under the conditions of gentle acceleration, deceleration, and coast.
The object is to observe the noise as you load the differential from both directions and also with no load on it.
Also note if cornering or braking have any effect.
Last edited by M. Schumacher; Aug 15, 2010 at 05:20 PM.
Thread Starter
Pro
Joined: Nov 2009
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From: Maple Grove Minnesota
Still trying to locate the source of the noise I hear (seems to be only at slow speed and while turning) once I have driven about 15 miles.
I replaced the bearing assemblies in the rear but it didn’t change a thing.
Is it possible for u-joints to make a winning noise? I know they need to be changed at least the main drive shaft by the clunking.
Would it be the pinion gear? Checked and added the proper mix but didn’t take much.
I replaced the bearing assemblies in the rear but it didn’t change a thing.
Is it possible for u-joints to make a winning noise? I know they need to be changed at least the main drive shaft by the clunking.
Would it be the pinion gear? Checked and added the proper mix but didn’t take much.
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Team Owner
Joined: Sep 2003
Posts: 20,179
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From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
U-joints are not really turning so the sound is unlikely to originate from there.
My guess is the L/R wheel brng but still can't confirm. I'm going to start some tests with a microphone to isolate the sound. Hope to find this annoyance soon.
Melting Slicks
Joined: Nov 2008
Posts: 2,765
Likes: 5
I've been chasing something similar for almost a year. It takes about 30 minutes of driving to warm things up then the whinning starts. I threw her out one time and confirmed its not the wifey.....
U-joints are not really turning so the sound is unlikely to originate from there.
My guess is the L/R wheel brng but still can't confirm. I'm going to start some tests with a microphone to isolate the sound. Hope to find this annoyance soon.
U-joints are not really turning so the sound is unlikely to originate from there.
My guess is the L/R wheel brng but still can't confirm. I'm going to start some tests with a microphone to isolate the sound. Hope to find this annoyance soon.
Ring & Pinion Gearset start to whine.
Wheel Bearings stay the same pitch or noise level cold or hot driving.
Just my experience as a Mechanic.
Nothing last forever.
Including Ring & Pinion gearsets.
Hopefully I am wrong.
Troubleshoot with a microphone - mechanic's stethoscope yet though.
BR
Team Owner
Joined: Sep 2003
Posts: 20,179
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From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Melting Slicks
Joined: Nov 2008
Posts: 2,765
Likes: 5
In my experience once a Hypoid Ring & Pinion Gearset starts to whine for whatever reason,
changing over to a synthetic makes the whining noise worse.
I like synthetic gear oils such as Royal Purple 75-90w.
Years ago you could Buy true straight mineral/ dino 140w gear oil.
You could find it at your local diesel repair shops.
It would help some with gear whine noises in passenger cars & trucks.
Its all gone though that straight 140w.
Last time I found 140w was around 15 years ago.
BR
