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Old 03-05-2015, 10:03 AM
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Newbie needs Brain Picking please

Hello all! I am new to a WJ, and new to Jeep Garage. After reading forums over past couple months, i decided to join.
So old guys, please help by letting me pick your brain. 2000 4.7 WJ. the 247 was bad, so I swapped a 242J into it. Swapped rear shaft too.
After the swap, it would grind terribly and not shift into 4x4. Turns out, a previous owner had replaced the driver wheel bearing/hub and driver axle shaft. But when they replaced the axle shaft, they used the one for Quadra-Drive, so it was an inch and a half too short. That was an easy fix, so took it on a road trip.
Seemed good until I hit 67mph. Then What i get is a very low frequency WWWWWUHWWWWW.....WWWWWWUHWWWWWW, ( almost like a really loud garbage truck outside your house). It has a wave frequency, it fades in and out about every 4 seconds. Also, a grinding sound has now appeared. Almost sounds like brakes grinding. I can't seem to isolate if it comes from a particular side. Cracked the front diff open, and oil is clean, no metal, and no noise when spinning it by hand.
So, what I ask of my new community is to throw ideas, similar stories, spitballs, fixes etc. at me.
I have also repaired the blend doors for heat, and can help others with that too!

Thanks,
Aaron

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Old 03-05-2015, 11:18 AM
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Re: Newbie needs Brain Picking please

Welcome to the garage Aaron.
Did you already try to drive without the front propshaft? It would unload the T case front output and the front differential. If the noise continues the same, i would expect a wheel bearing.
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Old 03-05-2015, 04:38 PM
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Re: Newbie needs Brain Picking please

Thank you! That is what I'm doing tomorrow. I know that it is constant if the car is moving and I drop the tranny into neutral.
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