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Unread 12-03-2010, 01:33 PM   #1
Hedwig
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DS Vibration - Pinion Angle?

2010 4D Rubicon, with a 2.5" Teraflex Lift (new springs, shocks, etc). Stock tires for now. New front and rear bumpers (winch also on front, and new swing-out tire carrier on rear).

I was originally getting a vibration / resonance around 35 to 45 MPH after the lift, but am now hearing a distinct grinding-type noise at these speeds (along with the original vibration). The noise and vibration appear to emanate from right under my feet, so I was thinking the front DS was needing re-balancing, or perhaps a new Tom Woods DS. However, from the posts on similar subjects, perhaps I need to consider new, adjustable upper control arms for the front, to tune in a new pinion angle, and keep the stock DS (kinda seems counter-intuitive in that the lift is only 2.5"....but stranger things have happened).

I'm thinking that I should remove the front DS anyway, until I can get this issue resolved (and to verify that the DS is, indeed, the problem).

Once the original tires are "used up", I'll eventually go with 33's. Am assuming that the new upper control arms would come in useful for this change as well.

Any input / advice will be gratefully appreciated.

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Unread 12-03-2010, 02:53 PM   #2
PanthersFan
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Is the noise only under acceleration? Mine was. I narrowed it down by removing the rear drive-shaft and driving around. Sound went away with the rear shaft off, so I know it was the TC or the rear diff. Turned out it was the rear differential. Had the shop put a rebuild kit in it the rear diff and sound is gone.

BTW: I've got a 2.5" lift, too. I put adjustable uppers on the back to correct the rear shaft pinion angle to see if that fixed my problem. It didn't - it was my pinion bearings.
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Unread 12-03-2010, 03:06 PM   #3
aristobrat
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Newbie question, but I didn't think the front DS spun unless you were in 4WD?
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Unread 12-03-2010, 03:07 PM   #4
Hedwig
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Noise is evident all the time between 35 and 45 (ish).

I'm fairly certain I should remove the front DS, just to ensure the noise isn't coming from somewhere else.
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Unread 12-03-2010, 03:10 PM   #5
Hedwig
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"Newbie question, but I didn't think the front DS spun unless you were in 4WD?"

I may be off-base, but I think it spins all the time, while the wheels are turning......
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Unread 12-03-2010, 03:25 PM   #6
MoparToYou
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It spins all the time, unless you have locking hubs that can be unlocked.

Take the front driveshaft off and drive the Jeep. If the vibration goes away it is from the front driveshaft.

You don't even need to take the whole driveshaft off. Just disconnect the axle end and tie it up with a bungie cord (don't use four wheel drive though).
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Unread 12-03-2010, 03:30 PM   #7
aristobrat
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Quote:
Originally Posted by Hedwig View Post
I may be off-base, but I think it spins all the time, while the wheels are turning......
Ah, ok -- so it's the TC end that's not engaged when in 2WD?
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Unread 12-03-2010, 03:34 PM   #8
Hedwig
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That's my understanding..
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Unread 12-04-2010, 04:38 PM   #9
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Well...........


Front DS removed, and there's still a vibration / resonance / noise from the front end. My assumptions are that there's an "issue" with the front diff., that's exacerbated by the DS.

Will make an appointment with the purchasing dealer. Only three months new, with 3k miles.
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