Rear diff crunching sound. - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-12-2012, 09:42 PM   #1
Jeeper
 
Blkbetty's Avatar
 
Join Date: Jun 2012
Posts: 15
Rear diff crunching sound.

Have an 04 jeep tj with a 4 inch suspension lift and factory diff. If I drive for a period of time and when I turn a corner ( or reverse ) it really protests against the turn and makes an awful grinding/crunchy sound. The bf thinks it may be the clutch. But Iv been out side of the jeep while he has reverse parked and the sounds is 100% coming from the rear end. Has any one had this problem?

Blkbetty is offline   Quote Quick Reply
Old 06-12-2012, 10:22 PM   #2
Jeeper
 
brokejeep's Avatar
 
Join Date: Oct 2009
Posts: 257
I did in my 06. It only had about 20,000 miles on it. Turned out it was the rear end lube. I put in Valvoline for a LSD & fixed the problem. Its got almost 42,000 on it now & hasn't made another sound.

brokejeep is offline   Quote Quick Reply
Old 06-12-2012, 10:28 PM   #3
Jeeper
 
Blkbetty's Avatar
 
Join Date: Jun 2012
Posts: 15
Ya I'm getting pretty close to that mileage right now. I'll have to try that I hope it will fix it. Is it a cheap fix?
Blkbetty is offline   Quote Quick Reply
Old 06-12-2012, 10:45 PM   #4
Jeeper
 
brokejeep's Avatar
 
Join Date: Oct 2009
Posts: 257
I don't remember how much the rear end lube was but dont forget the rtv silicone to make a new diff cover seal. All together shouldn't cost more than about $20.
brokejeep is offline   Quote Quick Reply
Old 06-12-2012, 10:47 PM   #5
Jeeper
 
Blkbetty's Avatar
 
Join Date: Jun 2012
Posts: 15
Ha that's peanuts compared to replacing the whole rear axel I really hope it fixes my problem. I have a sticker on it that says don't worry that noise is normal. Just because of that lol
Blkbetty is offline   Quote Quick Reply
Old 06-12-2012, 10:53 PM   #6
Jeeper
 
Join Date: Feb 2011
Location: Texas
Posts: 3,162
There's also chance that your gears are missing some teeth. With is about a 1000$ fix. That would actually be more probable. Hopefully some others will tell you what to look for. Though when you pop the cover. It should be rather obvious.
KidRock171 is offline   Quote Quick Reply
Old 06-12-2012, 11:09 PM   #7
Creepy Crawler

WF Supporting Member
 
BLK00TJ's Avatar
 
Join Date: Nov 2010
Posts: 3,194
Quote:
Originally Posted by KidRock171 View Post
There's also chance that your gears are missing some teeth. With is about a 1000$ fix. That would actually be more probable. Hopefully some others will tell you what to look for. Though when you pop the cover. It should be rather obvious.
Cost me $700 not counting taking it to three mechanics before it was correctly diagnosed. The first two wanted to replace my tranny without even pulling the diff cover even though I told them where the problem was. I had to drive around in FWD for two weeks before I could get it fixed. I believe the problem started when I broke both rear upper control arms allowing the rear axle to pivot. I don't know how long I drove like that before I noticed it. The gears didn't fail for another year or so.
__________________
Wheel. Break/Test. Repair/Upgrade. Repeat
BLK00TJ's YouTube Channel -- BLK00TJ's Build
BLK00TJ is offline   Quote Quick Reply
Old 06-13-2012, 08:04 AM   #8
Jeeper
 
Blkbetty's Avatar
 
Join Date: Jun 2012
Posts: 15
The gears shouldn't be to bad for me to do. I'm lucky enough to have a mechanically inclined friend who does all my work for free I will just have to track down a set of gears if that's my problem. He also was wondering could it be the slip limiter? He wasn't sure if I had diff like that and told me to go and ask the dealership but if u guys might no it will save me the hassle of going there
Blkbetty is offline   Quote Quick Reply
Old 06-13-2012, 11:40 AM   #9
Jeeper
 
Join Date: Feb 2011
Location: Texas
Posts: 3,162
Either way it would still be in the diff. I hope he is very mechanically inclined gear installation is an exact science. If you don't get it perfect it all goes to sh!t again.
KidRock171 is offline   Quote Quick Reply
Old 06-13-2012, 11:51 AM   #10
Jeeper
 
KBR97's Avatar
 
Join Date: May 2008
Posts: 5,136
Before you do anything just pull the diff cover, clean out all the fluid with some brake cleaner, silicone for new gasket, and refill.


I had a similar issue once. Ended up the diff was leaking and the fluid was a little too low.
KBR97 is offline   Quote Quick Reply
Old 06-13-2012, 01:22 PM   #11
Jeeper
 
Join Date: Feb 2011
Location: Texas
Posts: 3,162
You might only be missing one or two teeth and if you can get them out of the carrier so they stop banging and grinding on everything you might be able to get away with just that. For a little while.
KidRock171 is offline   Quote Quick Reply
Old 06-13-2012, 01:52 PM   #12
Jeeper
 
Blkbetty's Avatar
 
Join Date: Jun 2012
Posts: 15
Thanks guys for all ur help it gives me a place to start rather then not knowing what to do
Blkbetty is offline   Quote Quick Reply
Old 06-13-2012, 02:55 PM   #13
Jeeper
 
Join Date: Feb 2011
Location: Texas
Posts: 3,162
No problem. Start a thread on pulling the diff cover and how to RTV and refill it. If you would like to do it yourself. Itd be an easy and free self diagnosis.
KidRock171 is offline   Quote Quick Reply
Old 06-13-2012, 09:56 PM   #14
Jeeper
 
brokejeep's Avatar
 
Join Date: Oct 2009
Posts: 257
If & when you find the problem be sure & let us know what it is!
brokejeep is offline   Quote Quick Reply
Old 06-13-2012, 10:29 PM   #15
Jeeper
 
mikeyp03's Avatar
 
Join Date: Nov 2011
Location: CT
Posts: 115
I've been having this same problem since I got the my tj in october. The guy I bought it from said it was normal, but I've been thinking that it can't be
And everyone is always asking me what the noise is, and I had no idea what to tell them lol.

What is RTV? silicone sorry, should have read more
I'm thinking I'll try pulling apart the differential to take a look.
mikeyp03 is offline   Quote Quick Reply
Old 06-13-2012, 10:39 PM   #16
Jeeper
 
somis's Avatar
 
Join Date: Dec 2011
Location: Somis, CA
Posts: 704
Silicone is a rubber gasket maker that bonds metal to metal.

Put the Jeep on jacks. Pull the diff cover off. With wheels off the ground and a flashlight have someone spin the tires and looks for chipped or broken gears or loud unusual noise and make sure it feels smooth
__________________
When in doubt...FLAT OUT!
somis is offline   Quote Quick Reply
Old 06-13-2012, 10:45 PM   #17
Jeeper
 
somis's Avatar
 
Join Date: Dec 2011
Location: Somis, CA
Posts: 704
If you catch it early enough it will save you in the long run. Mine started with a messed up spider gear which ended up destroying everything. Ring gear, pinion and the entire carrier. New ARB carrier and the rest ran me 1500 bucks. And as someone stated earlier do not attempt to install a new rear end on your own unless your a mechanical genius with the right tools

Here's my old rear end issue

Click image for larger version

Name:	ForumRunner_20120613_194429.jpg
Views:	128
Size:	145.0 KB
ID:	131620
__________________
When in doubt...FLAT OUT!
somis is offline   Quote Quick Reply
Old 06-14-2012, 03:56 PM   #18
Newb
 
Join Date: May 2012
Location: auburn
Posts: 7
my 99 started making noise on my way home from work got home popped the d35 cover off and there was 4 teeth missing off the pinion gear lol
TJwheelin99 is offline   Quote Quick Reply
Old 06-17-2012, 06:14 PM   #19
Jeeper
 
Blkbetty's Avatar
 
Join Date: Jun 2012
Posts: 15
I most def will. Gunna pull the diff cover off this week and clean it up an inspect it and do the easiest one first.
U guys are the best
Blkbetty is offline   Quote Quick Reply
Old 06-17-2012, 08:34 PM   #20
Jeeper
 
Join Date: Feb 2011
Location: Texas
Posts: 3,162
Make sure to use gear oil not motor oil. Just saying.
KidRock171 is offline   Quote Quick Reply
Old 06-17-2012, 09:39 PM   #21
Jeeper
 
Blkbetty's Avatar
 
Join Date: Jun 2012
Posts: 15
Yes thank u. All though I am a chick I am not as mentally challenged as some
Blkbetty is offline   Quote Quick Reply
Old 06-18-2012, 02:11 PM   #22
Jeeper
 
Join Date: Feb 2011
Location: Texas
Posts: 3,162
Your a large step ahead of the pack then.
KidRock171 is offline   Quote Quick Reply
Old 06-18-2012, 02:20 PM   #23
Jeeper
 
Join Date: Apr 2012
Location: Cedarcreek, Mo.
Posts: 113
Looking for broken teeth is one thing, but look closer for metal filings as well. They won't necessarily be the source of your noise, but would be an indicator of something wearing abnormally. Could be cheaper to fix now than later.
Molaker is offline   Quote Quick Reply
Old 06-18-2012, 07:46 PM   #24
Jeeper
 
Blkbetty's Avatar
 
Join Date: Jun 2012
Posts: 15
Quote:
Originally Posted by mikeyp03
I've been having this same problem since I got the my tj in october. The guy I bought it from said it was normal, but I've been thinking that it can't be
And everyone is always asking me what the noise is, and I had no idea what to tell them lol.

What is RTV? silicone sorry, should have read more
I'm thinking I'll try pulling apart the differential to take a look.
Haha I have a sticker for mine that says don't worry that noise is normal, last year it made some pretty fancy sounds I replaced ball joints u-joints hub bearings both rear shocks and fixed a big dirty exhaust leak, so all those fun ones stopped now its just the rear diff so when it starts ( after driving for 45 mins. ( also wanted to add it doesn't make the crunchy sound all the time only when Iv been driving for about 45 min and it's hot, if I let it sit for an hour to cool off it doesn't make the sound any more ) I just turn the music up loud and sing as loud as possible lol
Blkbetty is offline   Quote Quick Reply
Old 06-21-2012, 06:11 PM   #25
Jeeper
 
mikeyp03's Avatar
 
Join Date: Nov 2011
Location: CT
Posts: 115
Quote:
Originally Posted by Blkbetty View Post
Haha I have a sticker for mine that says don't worry that noise is normal, last year it made some pretty fancy sounds I replaced ball joints u-joints hub bearings both rear shocks and fixed a big dirty exhaust leak, so all those fun ones stopped now its just the rear diff so when it starts ( after driving for 45 mins. ( also wanted to add it doesn't make the crunchy sound all the time only when Iv been driving for about 45 min and it's hot, if I let it sit for an hour to cool off it doesn't make the sound any more ) I just turn the music up loud and sing as loud as possible lol
Haha nice!

I havent really figured out Exactly when mine does it...I think it actually might be all the time, hot or cold. But its mainly when I'm turning the wheels and moving forward or in reverse slowly. I'll hear the loud crunching almost like a popping. Its terrible because it mainly happens in driveways so when I'm at someones house they think my jeep is falling apart

So I might take the diff. cover off in an hour or two, if not, then tomorrow.
I'll post my results too.
mikeyp03 is offline   Quote Quick Reply
Old 06-21-2012, 06:24 PM   #26
Creepy Crawler

WF Supporting Member
 
BLK00TJ's Avatar
 
Join Date: Nov 2010
Posts: 3,194
Quote:
Originally Posted by mikeyp03 View Post
Haha nice!

I havent really figured out Exactly when mine does it...I think it actually might be all the time, hot or cold. But its mainly when I'm turning the wheels and moving forward or in reverse slowly. I'll hear the loud crunching almost like a popping. Its terrible because it mainly happens in driveways so when I'm at someones house they think my jeep is falling apart

So I might take the diff. cover off in an hour or two, if not, then tomorrow.
I'll post my results too.
That sounds like spider gears to me. Pop the cover and take a look. If you ignore it you may be getting a regear sooner than you wanted.
__________________
Wheel. Break/Test. Repair/Upgrade. Repeat
BLK00TJ's YouTube Channel -- BLK00TJ's Build
BLK00TJ is offline   Quote Quick Reply
Old 06-21-2012, 09:29 PM   #27
Jeeper
 
somis's Avatar
 
Join Date: Dec 2011
Location: Somis, CA
Posts: 704
Quote:
Originally Posted by BLK00TJ
That sounds like spider gears to me. Pop the cover and take a look. If you ignore it you may be getting a regear sooner than you wanted.
And if you really ignore it for too long you could be goin down the freeway then all of a sudden BAM! (Knock knock knockin on heavens door)
__________________
When in doubt...FLAT OUT!
somis is offline   Quote Quick Reply
Old 06-23-2012, 10:39 PM   #28
Jeeper
 
mikeyp03's Avatar
 
Join Date: Nov 2011
Location: CT
Posts: 115
Well I just finished taking it apart and putting it back together.
Everything looked fine except the oil lol.
Filling it up with new oil was a PITA though!! the angle of the fill plug is annoying.

Time will tell if I still hear the noise.
mikeyp03 is offline   Quote Quick Reply
Old 06-23-2012, 11:54 PM   #29
Jeeper
 
somis's Avatar
 
Join Date: Dec 2011
Location: Somis, CA
Posts: 704
Quote:
Originally Posted by mikeyp03
Well I just finished taking it apart and putting it back together.
Everything looked fine except the oil lol.
Filling it up with new oil was a PITA though!! the angle of the fill plug is annoying.

Time will tell if I still hear the noise.
Did you look for bits or pieces of metal in the oil??? And you should just fill it til it pours back out the fill plug then cap it ASAP
__________________
When in doubt...FLAT OUT!
somis is offline   Quote Quick Reply
Old 06-24-2012, 02:43 PM   #30
Jeeper
 
mikeyp03's Avatar
 
Join Date: Nov 2011
Location: CT
Posts: 115
Quote:
Originally Posted by somis View Post
Did you look for bits or pieces of metal in the oil??? And you should just fill it til it pours back out the fill plug then cap it ASAP
Yea I looked for pieces of metal(I poured the oil from one container to another a few times) and also looked for filings/shavings when I wiped the gears. I didnt see anything out of the ordinary.
The fill hole is just straight on so I couldnt tilt the bottle of oil downwards. I had it straight on and had to squeeze the bottle and practically shoot the oil into it lol. Having a clear hose would have made it easier. Now Ill know that for the future though.

mikeyp03 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum 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 email address for yourself.
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

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 05:53 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC