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Unread 07-15-2013, 09:59 PM   #1
kingjake35
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Wj Vibrating/ humming coming from drivetrain?

So last winter I was driving on the highway and all of the sudden lost 4th gear. I took the car to the shop and on the way got it back. It was still a little funny feeling but my mechanic went in and said all he saw is that it was a little low on fluid. Now, there is a humming that sounds like it is coming from the transfer case, axle, or transmission. The sound gets louder the faster I go and is not based on RPM's. It also gets louder when I hit a bump but quieter the higher the suspension travels, then settles in the middle again at a medium noise level. I havent noticed a difference in how it is running and still has all its power, 4wd, and all functionality. It's gone this long with the noise and over 10k miles, but Im still curious if this could be something serious.

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Unread 07-15-2013, 10:31 PM   #2
davymark
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First thought would tell me bad joints on your drive shaft. They can give you driveline vibes and hums. Pretty simple Amd cheap fix. Doesn't explain your 4th gear loss, but does fit the description of everything else. I would replace those joints soon though... If that drive shaft falls off while your driving you could be looking at a very big headache.
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Unread 07-16-2013, 02:29 AM   #3
cykaaro
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As said, definitely look at replacing the u-joints in the rear shaft. One of mine went and it wasn't a happy feeling or noise. The rear one was seizing really bad all of a sudden with no real warning. Wasn't even any play in it. All good once replaced. As well, are your diffs leaking at all? what are the fluid levels like? Might as well check well you're at it. Also take a look at the tcase fluid level, and does it look/smell ok?

As for the front one, try taking it out and see if it makes any difference. I know with my front one, if the front gets pushed down too far doesn't sound too good at all. I suspect the front rezeppa is the issue (thats where the slip joint is on mine, as it has the rezeppa both ends). Only happens when I brake hard and the front suspension goes down far enough.
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Unread 07-17-2013, 08:44 AM   #4
kingjake35
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Alright. Well I just checked on my drive shafts. The rear shaft has no play and looks as it at least the front u-joint was replaced before I bought the car about a year ago. As for the front drive shaft (coming from the transfer case forward), there is tons of play. Mostly just spinning a little back and forth when I turn it, but it also moves a little into the front diff and transfer case. Is this a bad issue? and should I get it replaced soon? becajuse I do have the all time 4wd and I feel like since it is always being used I should have it checked on.
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Unread 07-17-2013, 08:56 AM   #5
davymark
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Quote:
Originally Posted by kingjake35
Alright. Well I just checked on my drive shafts. The rear shaft has no play and looks as it at least the front u-joint was replaced before I bought the car about a year ago. As for the front drive shaft (coming from the transfer case forward), there is tons of play. Mostly just spinning a little back and forth when I turn it, but it also moves a little into the front diff and transfer case. Is this a bad issue? and should I get it replaced soon? becajuse I do have the all time 4wd and I feel like since it is always being used I should have it checked on.
Yes. Replace that sucker asap. Are you lifted, or do you have future plans to lift it? If so this is a good opportunity to switch out drove shafts to a dc u joint style. Much better for lifts. I would still take you back one off and check it. Those rear joints have been known to seize up without having any play r visible signs. Take a couple minutes and totally worth it to check.
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Unread 07-17-2013, 09:32 AM   #6
kingjake35
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Quote:
Originally Posted by davymark View Post
Yes. Replace that sucker asap. Are you lifted, or do you have future plans to lift it? If so this is a good opportunity to switch out drove shafts to a dc u joint style. Much better for lifts. I would still take you back one off and check it. Those rear joints have been known to seize up without having any play r visible signs. Take a couple minutes and totally worth it to check.
I'm not lifted now but after I get out of college I plan to make this car my "toy". How much does the front driveshaft run and what are the pros of a different kind? and what do I look for when I take off the rear shaft? The front driveshaft mainly rotates. Is that worse or better off than if it was moving in and out of the transfer case.
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Unread 07-17-2013, 10:50 AM   #7
davymark
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Quote:
Originally Posted by kingjake35

I'm not lifted now but after I get out of college I plan to make this car my "toy". How much does the front driveshaft run and what are the pros of a different kind? and what do I look for when I take off the rear shaft? The front driveshaft mainly rotates. Is that worse or better off than if it was moving in and out of the transfer case.
If it were moving in and out of the transfer case then you would have a bigger problem. The fact that its rotating simply means your joints are worn out and need replace. The double cardan style drive shaft is good for lifts because of angles. They can run at a steeper angle than other styles of drive shafts. They're just some of the most popular style for lifted jeeps and u joints are much cheaper and easier to replace than other styles (in my opinion anyway). It depends on where you buy it from. You can go to your local jy and usually pull one and all the necessary components for $100-200 bucks. You could buy a custom one from Tom woods or Carolina or something along those lines and they can run anywhere between $300-700 depending on what you order.
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Unread 07-17-2013, 11:27 AM   #8
kingjake35
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awesome! thanks so much for the help. I'm glad I caught it before anything worse happened!
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Unread 07-17-2013, 06:09 PM   #9
davymark
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Quote:
Originally Posted by kingjake35
awesome! thanks so much for the help. I'm glad I caught it before anything worse happened!
Not a problem! Better to catch it before it falls off and blows up your transfer case or axle! Good luck with the repairs and let me know of you've got any other questions.
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Unread 07-17-2013, 07:33 PM   #10
psyviperx
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I think I an having a front ds issue to. I get a consistent buzz, quiet, buzz, quiet, ...at highway speeds. Thanks guys.
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Unread 07-21-2013, 09:00 AM   #11
kingjake35
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Alright, update. I went to the junkyard to take off a front shaft. It was in worse shape than mine but I wanted to take it off just to see. I got all 12 bolts out and i couldnt get the shaft to come off. Is there anything else I can do? Also, can I take the driveshaft off and just make it rwd for the time being?
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Unread 07-21-2013, 09:12 AM   #12
cykaaro
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If it's the double rezeppa, like mine is, I use a flat screw driver to coax the end on the t-case out. Once it's out, I push forward, so the slip-joint callapses, then can drop it, pull it off from the diff and slip it out.
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Unread 07-21-2013, 09:22 AM   #13
kingjake35
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ok great. Would it be alright to take mine off and drive it without the front ds just a couple miles to make sure that indeed is the problem?
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Unread 07-21-2013, 09:24 AM   #14
cykaaro
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It's how I did mine to prove my issue was my driveshaft. (I have the 242 t-case though so in 2WD anyways without the driveshaft) Many have done it if you search through the posts on front driveshaft problems though. The t-cases are different than in the ones the ZJ's used on the v8's.
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Unread 07-21-2013, 09:36 AM   #15
kingjake35
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yeah I have the 247. ill search to see. I want to make absolute sure that its the problem
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