Strange Vibration upon acceleration, sometimes - JeepForum.com

 
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post #1 of 11 Old 11-07-2012, 01:45 PM Thread Starter
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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post #2 of 11 Old 11-07-2012, 02:00 PM
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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post #3 of 11 Old 11-07-2012, 02:39 PM Thread Starter
zeaman
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Like the U bolts on the rear axle that hold the leafs down?
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post #4 of 11 Old 11-07-2012, 03:01 PM
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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post #5 of 11 Old 11-07-2012, 05:51 PM Thread Starter
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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post #6 of 11 Old 11-07-2012, 07:19 PM
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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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post #7 of 11 Old 11-07-2012, 07:31 PM
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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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post #8 of 11 Old 11-07-2012, 08:32 PM
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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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post #9 of 11 Old 07-26-2015, 12:09 PM
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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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post #10 of 11 Old 07-26-2015, 12:18 PM
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.

.

A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
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post #11 of 11 Old 07-26-2015, 02:34 PM
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Thanks Tim, I will try that. Also will start saving up for the SYE....
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