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Unread 04-01-2013, 12:56 PM   #1
AAK11
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1998 ZJ 
 
Join Date: Apr 2013
Location: Verona, NJ
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Drive chain wobble under load

My 98 Grand Cherokee 5.2 is out of balance under load, even relatively small uphills creates the vibration.
In neutral or downhill it's quiet.

How can I isolate the culprit? Can I remove the front drive shaft, or the rear one and test drive the Jeep?
I'm hoping it's just a u-joint or the double cardan. Could it be the transfer case?
I just want to fix the part that needs it, not refresh both drive shafts if we can avoid it.
Thanks

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Unread 04-01-2013, 01:12 PM   #2
AnotherRedZj
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if its not happening while in neutral, even reving it high, then it seems it would be a moving part. check both motor mounts and tranny mount first, then move on to drive shafts.

could also be under powered, check all plugs and wires, cap and rotor.....make sure your firing on all cylinders.
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5.2 crate - fourwheelcustoms 2.25 BB - 31x10.50 BFG at-ko's 249/242 swap - front drive shaft upgrade by driveshaftspecialistincorporated - jcr off-road front bumper - engo 12k lbs winch......
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Unread 04-01-2013, 01:15 PM   #3
AnotherRedZj
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also. if your driving a 98 GRAND cherokee......its not an xj.......its a zj
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5.2 crate - fourwheelcustoms 2.25 BB - 31x10.50 BFG at-ko's 249/242 swap - front drive shaft upgrade by driveshaftspecialistincorporated - jcr off-road front bumper - engo 12k lbs winch......
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Unread 04-01-2013, 02:14 PM   #4
Corrupt
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You can remove your front drive shaft and drive it around. If the vibration is still there then you know it's not the front drive shaft and you can continue looking elsewhere.
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Unread 04-01-2013, 10:56 PM   #5
dnuccio
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you can remove the rear driveshaft and drive it as well, just go easy on the skinny pedal.
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Unread 04-02-2013, 06:19 AM   #6
ratmonkey
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Quote:
Originally Posted by dnuccio View Post
you can remove the rear driveshaft and drive it as well, just go easy on the skinny pedal.
Then be sure to refill the transfer case after all the fluid drains out the back.

Can't remove the rear shaft.
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Unread 04-02-2013, 06:23 AM   #7
AnotherRedZj
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Quote:
Originally Posted by ratmonkey View Post
Then be sure to refill the transfer case after all the fluid drains out the back.

Can't remove the rear shaft.
This.
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Unread 04-30-2013, 07:12 PM   #8
AAK11
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Still looking for the problem. With front drive shaft out, it still shows the vibration.

Fresh u-joints and balancing on the rear drive line didn't help.
I think I'm down to a few possibilities:
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Unread 04-30-2013, 08:05 PM   #9
AAK11
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1- transfer case (replaced with a used unit a year ago)
2- rear differential
3- wheel bearing
4- transmission/motor mounts

The vibration is a little at idle, but shows up on acceleration, especially under load uphill.
Engine speed and vehicle speed don't seem to have any influence.

Anyone have a good idea?
Thanks.
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Unread 05-28-2013, 08:20 AM   #10
AAK11
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Bmeyst is correct.
The ignition system was worn out. New cap, rotor, plugs and wires solved the problem completely.

thanks.
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Unread 05-28-2013, 06:01 PM   #11
AnotherRedZj
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YAY!

I helped!
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5.2 crate - fourwheelcustoms 2.25 BB - 31x10.50 BFG at-ko's 249/242 swap - front drive shaft upgrade by driveshaftspecialistincorporated - jcr off-road front bumper - engo 12k lbs winch......
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