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 Post subject: 2005 CRD possible rear end noise
PostPosted: Fri Sep 08, 2017 5:21 pm 
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I just picked up this CRD a few weeks ago and I have been going through it trying to take care of all the outstanding issues.

I have a noise that I can hear in the cab after I get above 40MPH. It only happens when accelerating, if I let off the fuel pedal the sound immediately goes away.

I captured videos with my camera mounted on the front and rear of the vehicle, the sound was only captured while pointed towards the rear differential.

Before capturing this video I replaced all 4 tires, both front wheel bearings, front axle CV joint (closest to transfer case), both rear drive shaft U joints.

The noise existed before making the repairs listed above. Also this vehicle has a 2.5 inch lift.

Any clue on what this noise could be coming from?

Here is a video of the issue:

https://youtu.be/281IGBkazJg


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Fri Sep 08, 2017 6:48 pm 
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Joined: Fri Jun 22, 2007 11:43 am
Posts: 3862
Location: Green Cove Springs FL
Sounds like a bad bearing somewhere in the rear axle.
Removing the rear diff cover and inspecting the gear teeth is a good place to start.
Also grabbing the pinion yoke and trying to move it up and down will tell you if it's pinion bearings.

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Bought my '05 CRD on June 2nd '07, used with 29,000 miles.
intake elbow and EGR delete. 7 volt Etecno glow plugs
Yeti stage 2 ECU tune. Straight pipe exhaust. DIY intercooler hoses
Provent and modified factory 180F thermostat
Replaced cylinder head (cracked) at 160,000 miles + ARP studs
Cheap 1 inch lift, 245-75R-16 tires.
Still love it.


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Sat Sep 09, 2017 1:09 pm 
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Thanks for the insight. I pulled the cover off and to me it looks like I have too much slop in the spider gears. The pinion seems tight without any play.


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Sat Sep 09, 2017 1:20 pm 
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Joined: Fri Jun 22, 2007 11:43 am
Posts: 3862
Location: Green Cove Springs FL
Any metal chunks or glitter in the oil?
You may need new spider gears.
And when you pull the axles, might be a good idea to replace the axle bearings too.

_________________
Bought my '05 CRD on June 2nd '07, used with 29,000 miles.
intake elbow and EGR delete. 7 volt Etecno glow plugs
Yeti stage 2 ECU tune. Straight pipe exhaust. DIY intercooler hoses
Provent and modified factory 180F thermostat
Replaced cylinder head (cracked) at 160,000 miles + ARP studs
Cheap 1 inch lift, 245-75R-16 tires.
Still love it.


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Sat Sep 09, 2017 9:24 pm 
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Joined: Sat Aug 24, 2013 11:36 pm
Posts: 3145
Location: Central GA
What about the carrier bearings???? :roll:

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05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/Battery Tray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/Hayden HD clutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair,K&N


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Sun Sep 10, 2017 4:32 pm 
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I didn't find any metal in the oil or on the magnet. The axle bearings and carriers bearings to me seemed tight. I was not able to detect any play.

I did end up replacing the spider gears, the truck came with some new ones in a box so I tossed them in while I was in there. The rear brakes were shot and the driver side parking shoes were seized. I ended up replacing the parking shoes/hardware, rotors, and pads.

I filled the rear end up with 75w-140 synthetic gear oil along with a 4 oz bottle of friction modifier. I can still here the sound so it possible one of the bearings is bad but does not have any play yet. I recently replaced a loud wheel bearing on a mazda that had zero play but was very loud.

I'm going to order up some new axle/wheel bearings and carrier bearings and give it another shot soon.

Thanks for the help so far.


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Sun Sep 10, 2017 8:33 pm 
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Location: Central GA
Without pulling all the actual bearings and inspecting the rollers and races you may not be getting the whole story!
Especially the pinion bearings which the noise you described could well be a bad pinion bearing. Seen this many times before!
But unfortunately without any discernible play found in a bearing, the only proper way to truly inspect them is to pull them and look at the races and rollers...

:roll:

_________________
05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/Battery Tray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/Hayden HD clutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair,K&N


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Mon Sep 11, 2017 3:55 pm 
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Joined: Fri Sep 08, 2017 5:11 pm
Posts: 4
I just placed a part order this morning. I am going to rebuild the entire rear end.


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Mon Sep 11, 2017 9:18 pm 
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Location: Central GA
atunicus wrote:
I just placed a part order this morning. I am going to rebuild the entire rear end.

Good move!!! Rules em all out....

_________________
05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/Battery Tray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/Hayden HD clutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair,K&N


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Thu Oct 19, 2017 10:07 am 
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Joined: Mon May 03, 2010 12:20 am
Posts: 69
Location: Colorado
atunicus wrote:
........

I have a noise that I can hear in the cab after I get above 40MPH. It only happens when accelerating, if I let off the fuel pedal the sound immediately goes away............... I replaced all 4 tires, both front wheel bearings, front axle CV joint (closest to transfer case), both rear drive shaft U joints.

The noise existed before making the repairs listed above. Also this vehicle has a 2.5 inch lift.

Any clue on what this noise could be coming from?


I have been chasing this exact same problem for about a year now. I have done everything you have done with the exception of any internal diff inspection.

I would like to know if you have fixed the problem as you stated in your last post that you were going to take the diff apart and replace the needed parts.

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Marty

'05 CRD, GDE tune(s), JBA stuff, OME, Weeks Stage I & II +++


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Thu Oct 19, 2017 10:32 am 
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Joined: Sat Aug 24, 2013 11:36 pm
Posts: 3145
Location: Central GA
I just recently replaced the rear carrier in my Jeep with a new Dana Trac-Loc posi unit. I installed new carrier bearings and new axle bearings & seals (axle bearings requires inside slide hammer puller), pulled pinion bearings, inspected rollers and races and they were great shape so I did not replace them, only the pinion seal was replaced.

Rear end had a slight audible whine in it at cruising speeds before rebuild. It would change pitch when slightly turning from left to right which was an indicator to me of a carrier bearing issue.

Set backlash at 0.005 and preloaded pinion and carrier bearings as required.
After rebuild, no noise, all is quiet at speed, whine is completely gone... :BANANA:

Image

_________________
05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/Battery Tray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/Hayden HD clutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair,K&N


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 Post subject: Re: 2005 CRD possible rear end noise
PostPosted: Thu Oct 19, 2017 12:12 pm 
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Joined: Mon May 03, 2010 12:20 am
Posts: 69
Location: Colorado
WWDiesel wrote:
I just recently replaced the rear carrier in my Jeep with a new Dana Trac-Loc posi unit. I installed new carrier bearings and new axle bearings & seals (axle bearings requires inside slide hammer puller), pulled pinion bearings, inspected rollers and races and they were great shape so I did not replace them, only the pinion seal was replaced...... After rebuild, no noise, all is quiet at speed, whine is completely gone...


So do think it was the carrier bearings or the axle bearings (how did they look)? One of the places I took my Jeep to said that after removing the rear driveshaft (and plugging the TC tail shaft so fluid wouldn't escape), the vibration was gone. He also noticed excessive resistance in rotating the rear wheels due to possibly a Trac-Loc issue??

_________________
Marty

'05 CRD, GDE tune(s), JBA stuff, OME, Weeks Stage I & II +++


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