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Old 03-13-2013, 08:08 PM   #1
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Help with crazy humming / vibration

Ok I just got my 01 wrangler not to long ago and am trying to figure this thing out.

Last week changed all the dif fluids and today hop in and the same thing: when I accelerate vibrating a humming like crazy. Let off and nothing.

So I need to check my pinion seal/bearing?

This came with 4" lift and I changed the steering to accommodate but how do I check the angle to the rear you guys are talking about?

Any help is greatly appreciated.
Thanks Nate

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Old 03-14-2013, 04:10 PM   #2
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Update: I jacked up the rear end and watched the axel. It seems to be a lot of slop right where the drive shaft goes into the differential. I grabbed the drive shaft after to feel if there was any slop nothing when I grab it. But rock the tires back in forth while in the air and there is slop.

I don't know where to go from here. Any help?

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Old 03-14-2013, 05:20 PM   #3
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You are describing worn out pinion bearings. Time for a rebuild of the axle. If you have been wanting to re-gear, the time is now. If it's a Dana 35 axle, best replace it.

Fix it before it comes apart and you have to replace every part in the axle. Don't drive it, have it towed.
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Old 03-14-2013, 07:26 PM   #4
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It's a Dana 44 rear axel. So what are the best gear options?
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Old 03-15-2013, 03:56 AM   #5
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It's a Dana 44 rear axel. So what are the best gear options?
Depends on your tire size NOW and where you intend to end up. 4.11's are good for 33's. 4.88's are good for 35's. 5.38's are good for 37's.

You can't use 4WD until you have re-geared BOTH axles. Until then, you have to use 2WD only.
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Old 03-15-2013, 06:21 AM   #6
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That is good to know! I have 33" now and most likely going to stay there. I have a Dana 30 in the front so would the gears be the same? Sorry new to this.
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Old 03-15-2013, 08:45 AM   #7
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That is good to know! I have 33" now and most likely going to stay there. I have a Dana 30 in the front so would the gears be the same? Sorry new to this.

you will want the same gear ratio in both difs. check the tag on the dif cover to see what you have. when you get a gear set they will be for a dana 30 or 44.. it will be an option when you buy
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Old 03-15-2013, 09:50 AM   #8
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If you have a 5 speed and 33's, 4:56 gears are recommended.
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Old 03-15-2013, 09:53 AM   #9
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Here are the angle on my drive shaft I don't know much about that could this cause any problem?
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Old 03-15-2013, 10:15 AM   #10
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u have a t case drop? if not then id say the stock shaft is a prob
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Old 03-15-2013, 10:18 AM   #11
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your gunna need an sye and tom woods style shaft. or if you have a tcase drop and a body lift, you could install a mml, that could help a little or not at all, but its a cheaper way to go
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Old 03-15-2013, 10:53 AM   #12
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Originally Posted by Soli Deo Gloria View Post
Ok I just got my 01 wrangler not to long ago and am trying to figure this thing out.

Last week changed all the dif fluids and today hop in and the same thing: when I accelerate vibrating a humming like crazy. Let off and nothing.


Thanks Nate
Was it humming and vib.before oil changes? If it started after it could be bearings only
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Old 03-15-2013, 12:04 PM   #13
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Ok, I bought this and figured out it had a four in suspension lift. How do I tell if it has a TF case drop? I am not sure if I have one or not. The clinging/vibration started only a few days after I changed the fluid, nothing before that.
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Old 03-15-2013, 12:05 PM   #14
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I am hoping I am not going to spend a fortune on this - but I guess you gotta fix whats broken.
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Old 03-15-2013, 12:11 PM   #15
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My bet is your bearings are fine & your driveshaft angle is just too steep for the u-joints which will vibrate in protest. Once you get to the 4" suspension lift height, it's VERY difficult to eliminate u-joint vibrations from things like a t-case drop and/or a motor mount lift.

The usual solution and best way to resolve the vibrations is to install a SYE kit and aftermarket CV driveshaft.
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Old 03-15-2013, 12:43 PM   #16
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My bet is your bearings are fine & your driveshaft angle is just too steep for the u-joints which will vibrate in protest. Once you get to the 4" suspension lift height, it's VERY difficult to eliminate u-joint vibrations from things like a t-case drop and/or a motor mount lift.

The usual solution and best way to resolve the vibrations is to install a SYE kit and aftermarket CV driveshaft.
Jerry I know you really know your stuff on this. So you think a drive shaft upgrad is the way to go? Any recommendations? and other things needed.
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Old 03-15-2013, 12:46 PM   #17
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Yes, that is exactly what I would do... a SYE and CV driveshaft is the best/most correct way to eliminate those vibrations. Not to mention that type of vibration cannot just be lived with since they can start taking out u-joints, seals, bearings, etc.

Tom Wood is a great source for SYE and CV driveshaft kits, plus he'll help you figure out exactly what you need... he's really a great guy for both pre and post-sales support. Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist. Please tell him I sent you (ask to speak specifically with Tom) as I owe him for all the favors he has done for me over the years.
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Old 03-15-2013, 01:15 PM   #18
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Yes, that is exactly what I would do... a SYE and CV driveshaft is the best/most correct way to eliminate those vibrations. Not to mention that type of vibration cannot just be lived with since they can start taking out u-joints, seals, bearings, etc.

Tom Wood is a great source for SYE and CV driveshaft kits, plus he'll help you figure out exactly what you need... he's really a great guy for both pre and post-sales support. Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist. Please tell him I sent you (ask to speak specifically with Tom) as I owe him for all the favors he has done for me over the years.
Ok I called Tom (he was out so spoke to someone else)... sounds like this is a good place to start (hopefully I can afford all this) but from talking to them it seems they recomend adjustable control arms as well? And since I know nothing about them as well (although fairly machanically inclined) what am I looking at in price for those and is this something I can do myself. I don't have as much of a problem spending this kind of money if I can do it myself rather than having to pay someone a fortune on top of this.
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Old 03-15-2013, 01:33 PM   #19
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Yes, adjustable length upper rear control arms will be needed since the rear axle's pinion angle needs to be raised once a CV driveshaft is installed. Installing a SYE kit is not a trivial task but neither is it technical or difficult. SYE kits include complete instructions on how to install them so it's very likely something you can do in your garage at home. Replacing the OE fixed-length rear control arms with adjustable length control arms is a bolt-in process.
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Old 03-15-2013, 04:28 PM   #20
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Ok thanks for the help! Is it wise to change the barrings in the pinion at the same time?

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