Rear axle noise at 15-20mph+ -> wheel bearings? - Defender Source
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  #1  
Old January 14th, 2013, 09:05 PM
MonLand
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Rear axle noise at 15-20mph+ -> wheel bearings?

Hi,
Got around to replacing the water pump on the D90 over the weekend. I also replaced all the belts and hoses. Looking like new belts make the engine compartment quieter! Good!
However, after test driving it a little and on my way back from the gas station, I realized that I have some decent noise coming from the rear end. D90 has been sitting outside since November. I know I put new oil in both axles in Sept. noise is inexistent at very low (less than 15mph) speed. I confirmed this was not engine noise by letting the truck coast with dead engine. Really feels like it is coming from under the rear tub (I.e. not gearbox/tranny). Applying brakes does change (add or remove) noise.

Here is what I plan on doing next:
- pull rear axle plug to confirm there is still (good) oil in there.

Now, I've never pulled/done anything to rear axle since I got the truck a few years ago (and... Maybe 20K miles ago, truck has ~90K). I assume that wheel bearings in the back are as easy as the front to pull/replace (easier?). But I'm not sure I should go that route unless I can confirm those need to be looked at. Setup should be stock (I.e. not running wet hub).

Anyway, what do you guys think? High chance of wheel bearing? If so, how can I diagnose rear axle noise?

Thanks!
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  #2  
Old January 14th, 2013, 10:13 PM
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Charles Galpin
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Best bring it to HH thurs.
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  #3  
Old January 14th, 2013, 10:46 PM
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Yes HH, we'll jack it up and check the wheel bearings, but also keep in mind the ebrake drum can grab too so even at coasting you may hear it rubbing. But without hearing it can be tough to diagnose.
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  #4  
Old January 14th, 2013, 10:56 PM
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Recently, I took my truck in for a wash. The system had the undercarriage blaster wash, and I noticed hours after it drying, there was a whining coming from the rear underneath. After getting under and checking out everything, I decided to take the grease gun and hit all of the u-joints in the driveshafts.

Fixed it.
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  #5  
Old January 14th, 2013, 11:12 PM
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Quote:
Originally Posted by Kelbo View Post
Recently, I took my truck in for a wash. The system had the undercarriage blaster wash, and I noticed hours after it drying, there was a whining coming from the rear underneath. After getting under and checking out everything, I decided to take the grease gun and hit all of the u-joints in the driveshafts.

Fixed it.
For a moment I thought you were going to say that you had one of the car wash gnomes wedged up in the undercarriage.
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Old January 14th, 2013, 11:16 PM
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Quote:
Originally Posted by o2batsea View Post
For a moment I thought you were going to say that you had one of the car wash gnomes wedged up in the undercarriage.
Ha..

Bill, the car wash folks were staring at me like I was a gnome when I pulled in. "What is that?"

It is interesting to get under a new truck and investigate, though. You'll learn a lot about it's life....
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  #7  
Old January 17th, 2013, 01:01 PM
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How often do you guys repack your wheel bearings?
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Old January 17th, 2013, 01:09 PM
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Quote:
Originally Posted by MonLand View Post
How often do you guys repack your wheel bearings?
Every time I break an axle!
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  #9  
Old January 17th, 2013, 01:16 PM
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Quote:
Originally Posted by jefhuf View Post
Every time I break an axle!
Every time I get stuck in Lake Christy?
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  #10  
Old January 17th, 2013, 02:07 PM
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Really hard to tell where a noise is coming from when you are riding in the cab. I would start with inspecting/greasing the u-joints and going from there.

B
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Old January 17th, 2013, 02:19 PM
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grease the u joints and check the fluid in the rear diff
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  #12  
Old January 17th, 2013, 02:44 PM
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Check the e brake drum as noted above. Just feel it for temperature after driving it for a while and see if its hot.
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Old January 18th, 2013, 12:28 AM
MonLand
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Ok, I'll check the e-brake. Since I readjusted it back in Oct, maybe I did a poor job. U-joint got grease recently, but a little more won't hurt. Unless I messed up there should be fresh oil in Axle. Tonight, we confirmed no noise from the outside at low speed. I am more and more convinced that I need new bearings (or grease in the current bearings). I'll get under there over the weekend to confirm the rest and order parts on Monday (I think).
Thanks so far!
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I have an ex MoD and an ex wife. The two no longer conflict with each other.
Quote:
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Old October 1st, 2013, 01:10 PM
MonLand
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BTW.... I think this was wheel bearings (inside - driver side one).
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I have an ex MoD and an ex wife. The two no longer conflict with each other.
Quote:
it is not hoarding it is selective collecting
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MonLand
1995 D90 NAS
1996 Discovery NAS
2006 LR3 NAS (hers, but comfy! :) )
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