Whats do bad rear axel bearings sound like? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Whats do bad rear axel bearings sound like?

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineRuffstuff Axle Simple Swap Kit!ROCK BOTTOM prices on LIFT KITS at Rockridge4wd!! WANT TO

Reply
Unread 01-23-2012, 07:56 PM   #1
RamboPants
Registered User
1987 XJ Cherokee 
 
Join Date: Jan 2007
Location: Roanoke, VA
Posts: 1,307
Whats do bad rear axel bearings sound like?

I can't tell if its 1 bearing, both bearings or my brakes scraping or dragging. It makes a consistent scraping noise while im driving. I can jack the rear up and spin the tires and i can hear it, when i remove the brake drums it goes away....I have replaced the wheel adjusters and checked the brakes and everything looks fine. I don't smell hot breaks and there is no smoke...its driving me crazy.

RamboPants is offline   Reply With Quote Quick reply to this message
Unread 01-23-2012, 08:16 PM   #2
mj40
Registered User
1989 MJ Comanche 
 
Join Date: Jul 2011
Location: north bay/corbeil, ontario
Posts: 282
theres a lip on the outer edge of the drum and backing plates... look for rust dirt build up in the groove of the drums outer lip....look at the outer edge of the backing plates see if they are bent/twisted rubbing in the groove of the drums..and are the backing plates weak/rotten...allowing them to twist/flex(no year listed)
mj40 is offline   Reply With Quote Quick reply to this message
Unread 01-23-2012, 09:34 PM   #3
AZ Jeff
Web Wheeler
2014 JK Wrangler 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona, AZ
Posts: 7,464
Quote:
Originally Posted by RamboPants View Post
I can't tell if its 1 bearing, both bearings or my brakes scraping or dragging. It makes a consistent scraping noise while im driving. I can jack the rear up and spin the tires and i can hear it, when i remove the brake drums it goes away....I have replaced the wheel adjusters and checked the brakes and everything looks fine. I don't smell hot breaks and there is no smoke...its driving me crazy.
By virtue of the fact that the noise goes away with the drums removed, you know it's not a bearing noise.

Are the brakes assembled correctly? How about the condition of the retraction springs and associated hardware? Are the parking brake cables fully released? As mentioned by others, what about the condition of the drums?
__________________
AZ-Jeff
1992 XJ -- stock (RIP)
2000 XJ -- lots of basic mods. Sold to fellow forum member. I miss it.
2014 JK -- the project is just starting!
AZ Jeff is offline   Reply With Quote Quick reply to this message
Unread 01-24-2012, 05:51 PM   #4
RamboPants
Registered User
1987 XJ Cherokee 
 
Join Date: Jan 2007
Location: Roanoke, VA
Posts: 1,307
I didn't know if maybe there was something inside the diff that would make that noise also is what i meant. Im gonna pull the drums again check it out. I'll post back oh and when put my drums on are they suppose to drag a little? I always thought they were but if not maybe thats why its making noise.
RamboPants is offline   Reply With Quote Quick reply to this message
Unread 01-24-2012, 07:08 PM   #5
AZ Jeff
Web Wheeler
2014 JK Wrangler 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona, AZ
Posts: 7,464
Quote:
Originally Posted by RamboPants View Post
I didn't know if maybe there was something inside the diff that would make that noise also is what i meant. Im gonna pull the drums again check it out. I'll post back oh and when put my drums on are they suppose to drag a little? I always thought they were but if not maybe thats why its making noise.
Light drag is normal. It will be a slight scraping sound, but should not be heard over normal road noise even at very low speeds.
__________________
AZ-Jeff
1992 XJ -- stock (RIP)
2000 XJ -- lots of basic mods. Sold to fellow forum member. I miss it.
2014 JK -- the project is just starting!
AZ Jeff is offline   Reply With Quote Quick reply to this message
Unread 01-28-2012, 09:12 PM   #6
RamboPants
Registered User
1987 XJ Cherokee 
 
Join Date: Jan 2007
Location: Roanoke, VA
Posts: 1,307
Ok so i checked the drums, I sanded and grinded rust off both of them. The noise is still there so im thinking its coming from the diff. are the any bearings in the diff its self?
RamboPants is offline   Reply With Quote Quick reply to this message
Unread 01-28-2012, 10:31 PM   #7
AZ Jeff
Web Wheeler
2014 JK Wrangler 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona, AZ
Posts: 7,464
There is a whole pile of bearings in the diff. (actually, 4--two carrier bearings, and two pinion bearings.)

Is this noise only present when driving, or can you hear it if you jack up the rear end so both wheels are off the ground and you either (1) spin the driveshaft by hand or (2) put the vehicle in gear with the engine running so that the axle is spinning?

Doing the above test will help you isolate the problem. The first thing I would be looking at is a u-joint on the drive shaft. When they dry out, that can sometimes make grinding/scraping type sounds.
__________________
AZ-Jeff
1992 XJ -- stock (RIP)
2000 XJ -- lots of basic mods. Sold to fellow forum member. I miss it.
2014 JK -- the project is just starting!
AZ Jeff is offline   Reply With Quote Quick reply to this message
Unread 01-29-2012, 12:14 AM   #8
filluptrk
Web Wheeler
2000 XJ Cherokee 
 
Join Date: Dec 2006
Location: Coarsegold, CA
Posts: 1,203
When you say it makes noise with the brake drums on do you mean with the rim attached, or did you put the drum on and bolt it down without the rim, and let it spin? You might try it with the drums bolted down no rims, and see if it makes the same noise. And you might also put the rims back on and lift one side and with it running in gear see if the lifted wheel side makes noise, and do the same on other side. When it is running if it is in brake/bearing area you'll be able to hear it, if not on sides you'll be able to hear it in the center. It is possible that when you have no load on the rear end (with the drums off there is no drag from the brakes) that the noise does not show up. Put a load back on the rear end and if it is a bearing or U-joint noise it should show up right away.
filluptrk is offline   Reply With Quote Quick reply to this message
Unread 01-29-2012, 09:07 AM   #9
rjbruzan
Moderator
2004 TJ Wrangler 
 
Join Date: May 2008
Location: Lake in the Hills, illinois
Posts: 2,151
Rear axle noise will start around 15 MPH and not go away. Leave your rear hatch slightly ajar and it will be even louder. It will need a bearing kit and profesional set up to quiet it down.
rjbruzan is offline   Reply With Quote Quick reply to this message
Unread 01-29-2012, 10:54 AM   #10
RamboPants
Registered User
1987 XJ Cherokee 
 
Join Date: Jan 2007
Location: Roanoke, VA
Posts: 1,307
The sound is coming from the center while driving. I sat in back and let my dad drive so i could pin point the sound .Im gonna grease the u-joint 1st then go from there. If it inside the diff. how much would a rebuild or repair cost? or would it be cheaper to buy a junk yard diff?
RamboPants is offline   Reply With Quote Quick reply to this message
Unread 01-29-2012, 06:48 PM   #11
RamboPants
Registered User
1987 XJ Cherokee 
 
Join Date: Jan 2007
Location: Roanoke, VA
Posts: 1,307
Im not hearing anything when i spin the drive shaft or wheels while in N but i can feel the teeth from the gears engaging when i spin the wheels. Is that normal?
RamboPants is offline   Reply With Quote Quick reply to this message
Unread 01-29-2012, 10:10 PM   #12
AZ Jeff
Web Wheeler
2014 JK Wrangler 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona, AZ
Posts: 7,464
Quote:
Originally Posted by RamboPants View Post
Im not hearing anything when i spin the drive shaft or wheels while in N but i can feel the teeth from the gears engaging when i spin the wheels. Is that normal?
I am confused. First you said the noise was only present when the brake drums were in place.

Now you say you hear nothing when you spin the drive shaft, but you hear tooth engagement.

So what noise would you hear that goes away when the drums are removed? The gears mesh the same with and without the drums in place....

Have you jacked up the rear and put it in gear with the wheels elevated? What noises to you hear then?

Have you checked for sloppy u-joints?

Is you axle leaking/seeping any fluids?

Is the axle full of lube?

Have you removed the axle cover and inspected the lubricant for signs of metallic particles in the lube?
__________________
AZ-Jeff
1992 XJ -- stock (RIP)
2000 XJ -- lots of basic mods. Sold to fellow forum member. I miss it.
2014 JK -- the project is just starting!
AZ Jeff is offline   Reply With Quote Quick reply to this message
Unread 01-30-2012, 08:15 PM   #13
RamboPants
Registered User
1987 XJ Cherokee 
 
Join Date: Jan 2007
Location: Roanoke, VA
Posts: 1,307
I'll start from scratch.

Broke 1 of my e-brake cable and thought that cause the noise
Changed the e-brake cables and adjusted it, Noise still there
Took apart and inspected the rear brake setup replaced the adjuster screws and removed all the rust from the inside of drums. Noise still there
Turned wheels with drums and hear a light scrape. Removed wheels and drums and no scrape, Its not the wheel bearing and the scraping is normal brake noise for rear drum brakes.
Turned drive shaft with/without tires and drums, Light scrape with drums. No scrape without drums
Can feel gears when i spin the axles shafts and drive shaft.
Noise seems to be coming from the center of the axle while riding in the back seat.
Driveshaft dosn't move up and down only rotates left and right like its suppose to.
Changes the fluid and found metal shavings.

So now im convinced its a bearing. Just not sure which one and need help deciding on what i should do.
Junkyard
Try rebuilding myself
Paying someone to rebuild
RamboPants is offline   Reply With Quote Quick reply to this message
Unread 01-30-2012, 08:33 PM   #14
AZ Jeff
Web Wheeler
2014 JK Wrangler 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona, AZ
Posts: 7,464
The scraping sound may be coincidental and unrelated to the issue you describe.

So my next question--did you pull the axle shafts and look at the wheel bearings and the portion of the axle upon which the ride? If all of that is good, then your issue is in the diff. bearings.

So next question---does the noise change when the axle is under load, or coast, or "float" (neither load or coast)? If not, then it's probably a carrier bearing. If so, then it's a pinion bearing.

If you decide to fix this yourself, you need to study up on how to set up gears, since that will be what you need to check after change the bearing(s).

The other choice is to get an junkyard axle (make sure it's the SAME axle ratio as you have now), and swap that out. It's probably going to be easier in terms of technical difficulty, but more hassle in terms of actual work.
__________________
AZ-Jeff
1992 XJ -- stock (RIP)
2000 XJ -- lots of basic mods. Sold to fellow forum member. I miss it.
2014 JK -- the project is just starting!
AZ Jeff is offline   Reply With Quote Quick reply to this message
Unread 01-30-2012, 09:29 PM   #15
RamboPants
Registered User
1987 XJ Cherokee 
 
Join Date: Jan 2007
Location: Roanoke, VA
Posts: 1,307
Im leaning towards just replacing it, How much would a Junk Yard D-44 go for?
RamboPants is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.