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Unread 03-03-2013, 10:10 PM   #1
baritone_mike
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What is this chirping?

It is driving me crazy, it only happens when accelerating or going up hill (with the engine trying to accelerate). Since it only happens with load on the engine it seems like it would be something in the drive line. It will do it on what seem to be perfectly smooth roads and really bumpy roads the same. If you stop trying to accelerate (just let off the gas a little) the chirping stops, then comes back when you get back on the gas. It does it almost every time I take off from a stop light.

It sounds like someone is sending a telegraph and sounds like it is coming from the front left (but noise is tricky).

What should I check for this noise?

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Unread 03-04-2013, 09:46 AM   #2
jeff_in_rc
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The first thing I would do is check all of your u-joints, I had the same chirping from the passanger front but I could not hear it, my friend pointed out to me! Woops!
I found 3 bad joints so I replaced them all at the same time, both drive shafts and both front axles. Now all is well.
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Unread 03-04-2013, 09:55 AM   #3
Anticanman
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Ujoint or unit bearing
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Unread 03-04-2013, 09:56 AM   #4
Joe Dillard
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Check/search for "angry sparrows".
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Unread 03-04-2013, 10:08 AM   #5
jeff_in_rc
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Quote:
Originally Posted by Anticanman View Post
Ujoint or unit bearing
Forgot that one! I replaced mine at the same time just to be safe cause I had to beat the crap outta them to get them out!
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Unread 03-04-2013, 10:17 AM   #6
baritone_mike
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So it is probably just the driveshaft. If I take a picture can you guys tell me if my driveline angle is okay? I lifted the Jeep about 2 years/10,000 miles ago and this noist probably started 4 months ago, I have no vibrations from the driveline but if it is going to eat U-joints every 2 years I should probably look into fixing that. The Jeep does have 173k miles on it, and I think it is the factory driveshaft so it could just be from age.

Quote:
Originally Posted by Anticanman View Post
Ujoint or unit bearing
What is a unit bearing and where is it?

Quote:
Originally Posted by Joe Dillard View Post
Check/search for "angry sparrows".
Angry sparrows brings up dry CV joints on the front driveshaft in TJ/XJ. My YJ does not have a CV joint, that I know of, and the front drive shaft only spins when in 4wd. I also have no bird nests in my Jeep.
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Unread 03-04-2013, 10:33 AM   #7
Anticanman
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The unit bearing is the outer bearing bolted to the knuckle with three bolts and connected to your axle shaft and houses the wheel studs
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Unread 03-04-2013, 11:18 AM   #8
chuck172
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Can the hub/bearing "chirp" and have no play?
I'm getting the chirping too, but the hubs are tight.
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Unread 03-04-2013, 02:29 PM   #9
baritone_mike
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So I just grabbed the rear driveshaft and there is no play in it, side to side and up and down it is solid. If you try to spin it, the play is in the t-case/rear axle not in the u-joints. Is it possible it is still the U-joints on the driveshaft. My front drive shaft was redone about a year ago, since the slip joint in it seized.

How do you check the unit bearing? Also if it is in the front driveline, why would it chirp in 2wd only when accelerating/going up hill? I never get the noise if I am holding a constant speed on flat ground or decelerating. The front driveline should have no load on it in 2wd.
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Unread 03-04-2013, 02:40 PM   #10
jeff_in_rc
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Even tho you don't have power to the front axle the wheels will still spin and so will the axle's u-joints so I would check both of the axles joints just to rule them out. To check the bearings out jack up the front end and spin the wheels to hear if one side or the other is where the chirp is coming from.
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Unread 03-04-2013, 02:48 PM   #11
baritone_mike
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The chirp only happens when accelerating but I will go spin the tires and see if I hear anything.
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Unread 03-04-2013, 02:54 PM   #12
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While its off the ground, grab the top of the tire and shake it back and forth for any play in the bearing.
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Unread 03-04-2013, 03:10 PM   #13
baritone_mike
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Just went out and checked.

The front driveshaft has no play in it.

I jacked up each corner of the Jeep, none of the wheels have any play in them, and when you spin them they make no noise except for a little brake drag (but spin freely).

I also just checked the motor mounts, and they are good.
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Unread 03-05-2013, 07:43 PM   #14
baritone_mike
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Any other ideas or does it have to be the driveshaft/unit bearing and I just don't have the other symptoms of them being bad?
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Unread 03-05-2013, 10:46 PM   #15
dauster500
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i had the same issue...i discovered it was my rear drive shaft u joints...i kept driving with it...next thing i know going 60mph my ujoint finally failed...rear drive shaft ripped out...ended up destroying my transfercase, drive shaft, exhaust and ripping out a brake line

please learn from my mistake and fix it asap...
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