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Unread 10-13-2009, 08:14 PM   #1
AMD_GAMER
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1999 XJ Cherokee 
 
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Vibration at around 35 mph !!

Upon accelerating, I get vibration at around 35 mph (give or take a few mph). It sounds like it's in the drive-train, but I am not really sure. What would be some things to check. Would a bad motor mount or worn out shocks cause this? Also, I also get an intermittent humming/vibration noise when I am very lightly on the throttle (like 5% throttle). The noise comes and goes in 1 second intervals. It has been doing this for a good while and I am not sure what could be causing that noise. Any ideas?

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Unread 10-13-2009, 09:07 PM   #2
xjfever
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1995 XJ Cherokee 
 
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Could be a bad u-joint, pinion bearing, output bearing. It will be hard to know without getting under the jeep and checking everything out. If all seems good under there, you may have to remove the front shaft and see if the problem goes away. If it doesn't remove the rear shaft and drive in 4x4 to see if it goes away.
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  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
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Unread 10-13-2009, 09:27 PM   #3
xhavier_5478
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Are you sure you want to try removing the rear shaft and driving?
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Unread 10-13-2009, 09:39 PM   #4
xjfever
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Quote:
Originally Posted by xhavier_5478 View Post
Are you sure you want to try removing the rear shaft and driving?
On his model there will be no problem with doing this. With the 92 you have it will leak tranny fluid.
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  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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Unread 10-13-2009, 09:50 PM   #5
xhavier_5478
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What did they change on the output shaft for the 99?
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Unread 10-13-2009, 09:58 PM   #6
COLOUXJ
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it could also be a tire imbalance. try doing a rotation and see if it goes away. i had a vibration in the steering wheel and the jeep. it was just a slight vibration though just at 50 mph. if i went 45 it would not be there if i went 55 it would not be there
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is it a plink plink kerrrrdunk? or more of a brrrrrconk doc doc miiiidge pang!!!? or is it a badonk ka donk? if it is the latter its just the normal fat *** of the JK

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