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Old 12-23-2011, 09:56 AM
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Rumble strip noise in front end

I have an 02 overland with quadra drive that I recently bought. I noticed the other day on northway coasting at 75mph I get a light vibration/ noise that I can best describe as ridding over rumble strips. It doesnt do it at any speeds less then 65, and only while off the gas. In the last week I've done front and rear diff, tranny and transfer case fluids. Front pinion bearings felt good, no play at the yoke and carrier bearings feel tight, spun easy with no slope. Backlash was good as well but I didn't have any gear marking compund with me to check pattern. Ring and pinion teeth looked good visually though. Noticed a little play in the spider gears inside the carrier but wouldnt think this would cause that noise.
Tonight I pulled front driveshaft and noise was gone. Can't figure out what it could be. The u-joints on the axle seem good and tight at first glance, will open up more tomorrow. Please throw some ideas. Thanks
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Old 12-23-2011, 10:24 AM
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Re: Rumble strip noise in front end

The front propeller shaft is balanced from the factory and normally has some small balance weights welded to it. Maybe the balance weight is gone?
Also is the shaft completely straight? It could have hit something which has bend it slightly.
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Old 12-23-2011, 04:13 PM
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Re: Rumble strip noise in front end

The weights are still on the shaft. It doesn't look bent but Ill have to take a straight edge to it to make sure. I was playing with the u joints that were free, two that attach to the yokes, and they spin but require some force. Needle bearings look good inside Only thing i noticed was the u joint at the pinion, the cups that attach to the DS yoke have a little hitch in them when the u joint is perpendicular to the shaft. Move freely back and forth but feels almost like there's a groove in the middle of the motion.

Can the pinion bearings be bad if I can't feel any play at the yoke??
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Old 12-23-2011, 05:06 PM
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Re: Rumble strip noise in front end

Normally when the noise is there when coasting down, it is the pinion front bearing. But as far as i know, when a pinion bearing is faulty, you will hear it the whole time.
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Old 12-23-2011, 08:53 PM
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Re: Rumble strip noise in front end

Frango100. That's what I'm used to as well, hearing it any time u slow down. I got under and the pinion has no play at all. Up, down, side to side, Even in and out. There's a little play in the spider gears that I can feel when I spin pinion yoke. Just purchased new u joints for front drive shaft. Only $40 so I'll start there. None were dried out but a few caps had a little hitch and a little wear under the cap. This noise is gonna kill me!
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Old 12-23-2011, 09:46 PM
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Re: Rumble strip noise in front end

Is your Overland front shaft a Type 2 with a u joint at the front and a double cardan joint at the back. Mine is a 2004 and that is what I have. The thread I started concerns a noise more so than a vibration, but I am going to take my shaft out soon and take a closer look at the u joints there. A really bad joint can produce a vibration. Not sure about only getting it at a certain speed. With your shaft out and you not having the vibration, you'd think the problem would be in the shaft, but like my issue, without having the strain within the drive train, your problem could still be within the front axle or hubs or maybe the CV joints just behind the hubs.

This is the kind of stuff that can drive ya nuts, but with help here maybe someone has had the same thing or things and they will chime in and help.

Dave
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Old 12-23-2011, 11:22 PM
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Re: Rumble strip noise in front end

Yes is it that kind of front shaft. Mine is more of a noise as well, little vibration but definitly the rumble strip noise. I know what you mean without the shaft being in there. still could be front diff or T-case but it is nice not having that noise hahaha even though only 2wd Yes it is slowly driving me nuts, I know its a jeep but I like a solid vehicle. Front cv's felt solid when I pulled them to replace front seal. tonight i noticed front output on T-case had a little play up and down, pinion was real tight. Ahhh Im gonna loose it haha . Thanks for all the ideas!
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