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Old 10-27-2013, 01:38 PM
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Question Howl under load

Hey guys,
04 limited with 4x4 and the 4.7. At speeds above 65, I get a weird howl, only under acceleration. If I let off the gas, the noise goes away, floor it, goes away. There is no other noise associated with it, no vibration at any speed. I don't remember any locking or scrubbing or chirping at low speeds, no clunk when shifting gear from park to reverse or drive.
I slid under it, no movement on the diff end of the driveshaft. There is a little play on the tcase side tho. I can barely move it left right up down. Would that cause the howl?
What I've found online indicate a bad pinion bearing? But there's no growling or grinding, and no movement on the diff end of the dshaft.

This isn't my jeep, but best mimics the noise and occurrence.

whirring/howling noise from differential '97 Jeep ZJ Grand Cherokee - YouTube

In the description he has the broken spider gears vid where he believes the problem was....


Is this where I should focus first when I put it up ?
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Old 10-27-2013, 03:53 PM
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Re: Howl under load

I would first check the front diff fluid level and when ok, i would take a sample after driving a bit to see if there is any metal in the fluid. Also check the T-case fluid for level and metal.
Could be a wheel bearing as well.
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Old 11-04-2013, 12:41 PM
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Re: Howl under load

Thanks for the quick reply Frank. I'll check that and go from there. Is there supposed to be a small amount of play on the tcase side of the drive shaft? Only enough to make a small clank noise when i manhandle it.
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Old 11-04-2013, 08:04 PM
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Re: Howl under load

It is normal that you can turn the T-case output drive to the front propeller shaft a bit, due to the slack in the drive chain inside the T-case. If this slack gets too big, the chain can start skipping teeth and cause noises, but never heard of a howling noise due to this.
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