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Old November 27th, 2011, 09:05 AM   #1
shawn
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Default Pinion Breaing or Gear whine?

I've developed a terrible whine under load, and it keeps getting louder and higher pitched the faster you go. How do you tell the difference if it's the pinion bearing or the gears?

This is on a D44 in my 06 LJ. I know the front is a crush sleeve, but the 44 shouldn't be, right? All the 44's I've had apart are not crush sleeve, but it's been on my mind since I just replaced my pinion seal.
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Old November 27th, 2011, 09:11 AM   #2
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Time to pull the dif cover and look at the gears. I think gears tend to whine more than bearings. A bad bearing is more of a rumble.
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Old November 27th, 2011, 09:41 AM   #3
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I've had the cover off a couple times and the pattern doesn't look out of the norm. So, what am I looking for to determine if it's gear noise?
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Old November 27th, 2011, 09:59 AM   #4
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sounds like one of the carrier bearings. Ive seen them several times where the bearing looks good until you cut the cage off then the inner race is hammered. I actually just had a truck last week at work with the same symtom and that was the culprit
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Old November 27th, 2011, 10:04 AM   #5
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you just changed the pinion seal. i am betting its a pinion bearing.
how did u reset the pinion bearing load when u removed the yoke and seal?
if you just cranked it on with an impact, its not right, and possibly munched a bearing.
any play at the yoke when the ds is removed?
have a friend put it in gear, and give a little gas with the parking brake set.
see if the yoke moves in any direction.

i thought tj/lj 44's were set up with a crush sleeve, but i could be wrong.

good luck
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Old November 27th, 2011, 10:06 AM   #6
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the rubicon 44`s had shims not crush collars. At least all the ones ive geared have been. and the tj 44`s also have had shims

Last edited by joescamaro67; November 27th, 2011 at 10:16 AM.
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Old November 27th, 2011, 02:33 PM   #7
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Yeah, should be shimed not crush sleeve so I just tightened it back down, but it didn't have any play in it. I had to overhaul a D60 in an E250 because it had a bad whine from the rear end, but I forget if I had to reset anything or just put on new bearings. Whatever I did it works to this day just fine.

Guess I'll get an install kit and just take it apart and put new bearings on and check preloads and pattern and cross my fingers.
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Old November 27th, 2011, 02:51 PM   #8
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If you remove the driveshaft and carefully turn the pinion, you should be able to feel a bad pinion bearing in the free spin of backlash.
Another way would be to listen with a stethoscope while running the axle with the vehicle securely on stands. You will be able to pin down a failing bearing by location on the housing.
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Old November 27th, 2011, 06:54 PM   #9
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bad pinion bearings usuallly make noise when you left off the go pedal.

but given that you replaced the pinion seal, you might of not done something right on the reinstall and the pinion could be walking back and forth as well.
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