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Old 12-22-2007, 12:53 AM   #1
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Whining Noise From Front Axle

Hello,

I´ve a new problem.
After installing the gears and lockers everything was ok for 1000 mls. Then I added some additional 2.5" Spacers in the front and 2" Spacers in the rear to get some more Lift and to level the Jeep out.

Now I have a quiet whining noise from the front axle at about 35-45 mph and 70-80 mph. The noise becomes a bit louder when I accellerate. From the inside (with hardtop) I can only hear this noise when I know that it´s there. My father told me about it after I passed him we he was out with their dog.

I checked the front differential oil and it looks like new. After driving one hour with 75 rpm i touched the front diff and it felt nerly cool like the rear diff.

What could cause this noise? Can I damage something if I don´t do anything?
This noise isn´t annoying to me, it´s ok.

Thanks i advance.
nicolas-eric


p.s. Sorry for my bad english...

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Old 12-23-2007, 01:33 AM   #2
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Nicolas, do you hear it more when you are coasting or when you are accelerating? And when you checked the oil did you just remove the cover and inspect everything?

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Old 12-23-2007, 03:54 AM   #3
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when i hold the speed it isn´t really noticeable. i hear it more when i am coasting but when i accellerate it becomes also a bit louder..
i only checked the oil.

i never drove in 4WD with the new gears. yesterday i drove in 4H the first time and the noise was louder than in 2H. after about 30 mls in 4H it became quieter and now after 50 mls in 4H it´s also quieter in 2H.

perhaps the new gears need some more miles in 4WD to run in?

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Old 12-23-2007, 04:42 AM   #4
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does it get louder when you put load by turning hard.. if so it could be wheel bearings.
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Old 12-23-2007, 10:52 AM   #5
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It is also very possible that your pinion angle is no longer in the correct position, to your drive line. Especially after adding the hockey pucks. You may have to get the adjustable lower control arms, to rotate your pinion upwards a little. That should decrease the bind put on the u-joints. This is of course, just another possibility.
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Old 12-23-2007, 11:43 AM   #6
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bad wheel bearings sound like a bag of marbles hitting each other and the loudness usually changes with speed...
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Old 12-23-2007, 02:48 PM   #7
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now after about 100 mls in 4H i can describe the noise a bit better.

in 2H it´s only a very quiet whining noise at about 40 mls.

in 4H it´s a bit louder when i accellerate or hold the speed. when i´m coasting (i have an auto tranny) it becomes louder and sounds like a small driller at the dentist.

the rear driveline angle is ok. i have no vibrations.

do you really think that the front driveline angle could cause these whining noises?
you could be right. i noticed this noise the first time after putting in the 2.5" pucks in the front. perhaps another poblem is that the axle came 1.5" to the right because of the stock track bar. an adjutable track bar is already ordered.

today i checked the diff oil again. it still looks like new. and the diff didn´t become too hot.
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Old 12-23-2007, 02:53 PM   #8
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Quote:
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bad wheel bearings sound like a bag of marbles hitting each other and the loudness usually changes with speed...
well it depends on how bad the bearing are. I heard a low hum to what your describing.
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Old 12-23-2007, 03:33 PM   #9
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who did your gears
your backlash could be off that will cause the gears to wine
but if your backlash is off then the pinion depth might not be right
whoever set up your gears might have been in a hurry and not set them up right

my gears have never made any noise

I would have your backlash checked and if it is off then you should check you gear pattern
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Old 12-23-2007, 03:56 PM   #10
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i heard some wrong installed gears before. but there the whining noise was the same in 2H and 4H.
what makes me a bit confused is that the noise changes when i shift to 4H.

in the next days i will remove the front driveshaft to see if there is still a noise without front driveshaft.
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Old 12-23-2007, 06:53 PM   #11
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It does sound like gear noise to me, but im un-clear if jeeps are actual part-time 4x4-I know they dont have lock-outs but when its in 2hi is the front end disengaged at the transfer case or the front hubs. My point is if everything in the front-end is still rotating but disengaged(in 2hi) at the transfer case then the gear whinning will be less and will make more noise in 4hi when everything is actually being driveshaft driven
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Old 12-23-2007, 07:43 PM   #12
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Quote:
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My point is if everything in the front-end is still rotating but disengaged(in 2hi) at the transfer case then the gear whinning will be less and will make more noise in 4hi when everything is actually being driveshaft driven
if you have the lock out hubs you wont here the gear whine in 2wheel drive with the hubs disconnected
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Old 12-24-2007, 09:57 AM   #13
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yeah - lock outs disengage everything. im assuming his doesnt have lockouts so hes hearing the noise in 2hi as well
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Old 01-18-2008, 07:36 PM   #14
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today we made the first service with the new gears/lockers (axle oil change). we tested it out and the ring&pinion is installed perfect.

do you think that the whining noise is caused by a wrong pinion angle? is 4.5" lift enough for such a problem?

could i correct it with some of these cam bolts in the lower CA mount at the front axle? it looks like my TJs has some cam bolts there, but there are only some normal bolts installed.

where can i buy these cam bolts? are the available as a spare part from jeep? do you have a part '?



another buddy from australia said it could be the pinion bearing. but whats the pinion bearing? i dont know th word "bearing". sorry, my english isnt perfect.

any other ideas...?
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Old 01-18-2008, 08:39 PM   #15
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im also wondering about this and dont know if its realted or if i should make my own thread, but whenever i put it in reverse it makes a whining noise from like the tranny i think or rear axle nim not sure



oh adn by put i mena its ifne whne it in gear with clutch in but when moving it makes the noise and gets louder as i go faster in reverse
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Old 01-18-2008, 09:39 PM   #16
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Quote:
Originally Posted by debruins View Post
im also wondering about this and dont know if its realted or if i should make my own thread, but whenever i put it in reverse it makes a whining noise from like the tranny i think or rear axle nim not sure



oh adn by put i mena its ifne whne it in gear with clutch in but when moving it makes the noise and gets louder as i go faster in reverse
if your jeep is a manual transmission this is normal. all manual transmissions have helical cut gears on the forward side but the reverse gears and idler gear which activates it are straight cut gears that will always make some noise...don't worry..
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Old 01-18-2008, 09:57 PM   #17
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The pinion bearing is shown here on the pinion.
Click image for larger version

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Old 01-18-2008, 11:09 PM   #18
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pull it apart and check everything. leaving it and driving like that WILL destroy your new stuff. i just had to replace the rear on my dads GC because the pinion bearing went and allowed the pinion to move a little. it ended up chewing the pinion and ring gear until it overheated the axle and melted the seal causing a smokescreen behind him while going 75mph down i295. the thing got so hot that it warped the whole axle housing. good thing about it was that it gave me an excuse to put in a rear with disc brakes. the good thing about your problem is that it is giving you an excuse to put a d44 in there!!!
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Old 01-19-2008, 12:48 AM   #19
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is it hard to replace the pinion bearing?
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Old 01-19-2008, 01:11 AM   #20
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no, not really. just make sure ytou get a kit so you get the crush slevae and stuff. you gotta take the whole dif out an all. but other tahn that iat aint sao bad. just amake sur eto torqu shit tpo the rite torque. if oyu aintn ever done it before take it to a shop mna, theyl do it rite but itl cost you like 3-500$ or miore.
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Old 01-19-2008, 10:08 PM   #21
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Quote:
Originally Posted by nicolas-eric View Post
today we made the first service with the new gears/lockers (axle oil change). we tested it out and the ring&pinion is installed perfect.

another buddy from australia said it could be the pinion bearing. but whats the pinion bearing? i dont know th word "bearing". sorry, my english isnt perfect.

any other ideas...?
Quote:
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is it hard to replace the pinion bearing?
The guy who installed your gears already did it once, are you sure he did it OK?
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Old 01-19-2008, 10:40 PM   #22
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Quote:
Originally Posted by 350chevrolet View Post
no, not really. just make sure ytou get a kit so you get the crush slevae and stuff. you gotta take the whole dif out an all. but other tahn that iat aint sao bad. just amake sur eto torqu shit tpo the rite torque. if oyu aintn ever done it before take it to a shop mna, theyl do it rite but itl cost you like 3-500$ or miore.
looks like something i woulda wrote!
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Old 01-19-2008, 10:49 PM   #23
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no, not really. just make sure ytou get a kit so you get the crush slevae and stuff. you gotta take the whole dif out an all. but other tahn that iat aint sao bad. just amake sur eto torqu shit tpo the rite torque. if oyu aintn ever done it before take it to a shop mna, theyl do it rite but itl cost you like 3-500$ or miore.
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looks like something i woulda wrote!
OMG you've got twin.
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Old 01-20-2008, 01:32 AM   #24
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looks like something i woulda wrote!
OMG you've got twin.


what?? did i miss something here?
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Old 01-20-2008, 11:37 PM   #25
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Quote:
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what?? did i miss something here?
By that i'd assume he is talking about spelling errors
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Old 01-20-2008, 11:46 PM   #26
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^^
o my bad, i was, uh, intoxicated. fun party, hot girls, and rum will do that to you.
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Old 01-20-2008, 11:49 PM   #27
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^^
o my bad, i was, uh, intoxicated. fun party, hot girls, and rum will do that to you.
You had all that going on..........................and decided to log onto WF?
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Old 01-20-2008, 11:59 PM   #28
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it was kinda between 2 parties when i came home to change, and no, i wasnt driving. but yeah, long story....
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Old 01-21-2008, 12:10 AM   #29
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You had all that going on..........................and decided to log onto WF?
lol i like when people say oh i'm so drunk right now, and they are on wf.. if you're drunk you would not be able to log on and if you're here than youre not drunk enough so..

lol

After an amazing weekend party that started friday i feel lonely now as i'm all alone in my house without any friends :cry:.
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Old 01-21-2008, 04:11 PM   #30
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Nicolas, if you are describing a whining noise then there is only a couple things that could be wrong and it's not the front pinion angle. That could create a vibration, but not a whining noise. If you can grab your front driveshaft and get movement out of it by shaking it then it's possible that your pinion bearing could be bad or that he possibly crushed the crush sleeve too far when they installed the ARB. They are only good for one use. Otherwise I'd also suggest checking to make sure your TCase is full and that the fluid is good in there.

But honestly man how you described the noise at first I'm still calling it a deacceleration gear noise.

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