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Old 01-19-2016, 10:34 PM
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Front end hum in 4wd

I have an 01 Grand Cherokee 4.0 I6 with selec-trac and about 145k. The frontend makes a noticeable hum when accelerating in 4wd Full Time. When the gas is let off the noise subsides. In 2wd the noise is not present at all. From doing some research I have been wondering if the pinion bearing in the front differential is bad? That's just a guess, the noise isnt absurdly loud YET, because I assume it will the more I use 4wd this winter season. Any input would be great!

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Old 01-20-2016, 11:44 AM
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Re: Front end hum in 4wd

Did you check the fluid in the front diff? The level and take a small sample and check for glinsters in the fluid.
Also check the front prop shaft joints for play. Does it have CV joints (check the boots for cracks), or U-joints?
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Old 01-20-2016, 02:25 PM
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Re: Front end hum in 4wd

Almost positive it has cv joints, and I most definitely need to change the fluid on both differentials as I have no idea when it was last changed. It's just such a weird sound it makes the car sound like a diesel.
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