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Unread 11-07-2012, 12:45 PM   #1
zeaman
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Strange Vibration upon acceleration, sometimes

I recently put heavy duty rear leaf springs on my 01 xj, it lifted the rear way more than I thought and I had major driveshaft vibration. I added the shims and installed a transfer case lowering kit and it smoothed everything out. However, lately I have noticed when accelerating hard and steady, that there is a vibration/knocking under the center of the car, and I can feel it in my feet. It doesnt feel like the old vibration, or an exhaust rub, would this be a U joint, or is this a little vibration left over from the drive shaft?

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Unread 11-07-2012, 01:00 PM   #2
cory4um
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Re-torque all suspension bolts.
had a friend do a small lift. Never went back over the bolts after several hundred miles. Had a shake on accel.. I found the passenger u-bolts loose...
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Unread 11-07-2012, 01:39 PM   #3
zeaman
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Like the U bolts on the rear axle that hold the leafs down?
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Unread 11-07-2012, 02:01 PM   #4
cory4um
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Originally Posted by zeaman View Post
Like the U bolts on the rear axle that hold the leafs down?
Yup.
Its worth looking into.
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Unread 11-07-2012, 04:51 PM   #5
zeaman
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All of the bolts are tight, I noticed today the vibration is only noticeable under a lot of force. Could this be drive shaft u joints?
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Unread 11-07-2012, 06:19 PM   #6
CJ7-Tim
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Quote:
Originally Posted by zeaman View Post
...... noticed today the vibration is only noticeable under a lot of force. Could this be drive shaft u joints?
Very likely so. Any lift will often bring to light worn out u-joints. Vibes that are acceleration only, or deceleration only, are usually from worn u-joints. U-joints are cheap and easy, you probably could use some fresh ones.
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Unread 11-07-2012, 06:31 PM   #7
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Quote:
Originally Posted by CJ7-Tim View Post
Very likely so. Any lift will often bring to light worn out u-joints. Vibes that are acceleration only, or deceleration only, are usually from worn u-joints. U-joints are cheap and easy, you probably could use some fresh ones.
I've been thinking of doing my driveshaft u-joints too. Spicer 1310's are the correct ones for the driveshafts right?
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Unread 11-07-2012, 07:32 PM   #8
CJ7-Tim
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Quote:
Originally Posted by joshrad View Post
Spicer 1310's are the correct ones for the driveshafts right?
Yes.
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Unread 07-26-2015, 11:09 AM   #9
saludalabs
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Vibes during acceleration.

Quote:
Originally Posted by CJ7-Tim View Post
Very likely so. Any lift will often bring to light worn out u-joints. Vibes that are acceleration only, or deceleration only, are usually from worn u-joints. U-joints are cheap and easy, you probably could use some fresh ones.
Have Vibes after 3 inch lift RC (new springs and leafs)
Tim Could I have bad U-Joints on my front drive shaft. The rear drive shaft had the U-Joints replace and balance at a machine shop. Still have the vibes. The shop wants to do a transfer case drop, since the vibes only happen during acceleration. Thanks David
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Unread 07-26-2015, 11:18 AM   #10
CJ7-Tim
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Remove the front drive shaft and go for a test drive over the same roads/conditions that produces the vibes.

1997-2001 are more prone to vibes, and 00-01 have the low pinion D30 front axle which increases front driveshaft angles. IMO, a T-case drop should be considered a temporary solution, until you save up for an SYE.
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Unread 07-26-2015, 01:34 PM   #11
saludalabs
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Thanks Tim, I will try that. Also will start saving up for the SYE....
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