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Old 12-17-2012, 07:52 AM   #1
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What are some symptoms of a bad differential?

Mechanic told me that he hears grinding in my differential and wants to charge me a mint! Oddest thing is he says it might be the cause of my slight death wobble. Never saw that as a cause. Opinions?

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Old 12-17-2012, 08:10 AM   #2
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Death wobble is steering/suspension related, a bad differential has nothing to do with it. As far as symptoms, the main symptom I've seen will be noise. How noisy is it?

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Old 12-17-2012, 08:11 AM   #3
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My jeeps kind of loud in general, modified exhaust and the like. Granted I'm past 50K since I got it. I know I have to change it. I tried to hear what he's hearing but it seems like he's trying to take me for a ride. What type of noise would it be? A whining?
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Old 12-17-2012, 09:20 AM   #4
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remove the cover and see what the insides look like. a bad diff with usually show clear signs like broken gears and parts, chunks of metal, etc. that will tell you what exactly is bad...like spider gears, cracked carrier, ring gear, etc.

the internals have absolutely nothing to do with your wobbles. also, there is no "slight" death wobble. DW is characterized by a loss of most steering control due to severe harmonic steering movement & vibrations, requiring you to stop the vehicle in order to regain control. you either have DW, or you don't. it sounds like you have slight harmonic steering feedback...not DW. either way you need to identify the cause - alignment, tire balance, worn track bar, worn steering components (ball joints, unit bearings, tie-rod ends, etc).
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Old 12-17-2012, 09:32 AM   #5
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Originally Posted by UnlimitedLJ04 View Post
there is no "slight" death wobble. DW is characterized by a loss of most steering control due to severe harmonic steering movement, requiring you to stop the vehicle in order to regain control. you either have DW, or you don't.
X2...find another mechanic.
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Old 12-17-2012, 11:11 AM   #6
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Mechanic told me that he hears grinding in my differential and wants to charge me a mint! Oddest thing is he says it might be the cause of my slight death wobble. Never saw that as a cause. Opinions?
A bad driveline ujoint or bad pinion bearing can make all sorts of noise and vibrations throughout the tub.

To add what Unlim stated...when Deathwobble occurs, you think you are going to die and you may mess your pants.

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