Shaking

Tiny
RDBOEHMER
  • MEMBER
  • JEEP CHEROKEE
We have a 1996 Jeep Grand Cherokee Limited, V-8, 4WD with 188k miles. We have the same problem that is described by the owner of the 1999 Jeep Grand Cherokee Laredo. That is, the vechicle will shake violently when it hits a bump in the road. This seems to occur randomly and at speeds above 40 mph. When it happens, the whole front shakes up and down as if I were driving over a rough road. The shake is at a relativitly high frequency of at least 2 per second.

I have taken it in to the shop and, of course, when they test drove it nothing happened. They did put it on a lift and checked thightness, etc. And even ran it to make sur drive shaft and U joints were aligned.

Your response to the 1999 owner was to check alignment. If alignment were the problem, wouldn't this show in unusual wear of the tires such as the tread not wearing uniformly from inside to outside? What would recommend to change first?

Thanks much for your help.
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Sunday, July 22nd, 2007 AT 11:58 AM

5 Replies

Tiny
DIPWEED23
  • MEMBER
Shocks are a fairly inexpensive part to replace IF you can do the work yourself.
I had a 1988 Cherokee that had the same issue. Hit a bump and it would bounce all over the place.
Since a mechanic checked the tightness of most of the undercarriage components, it's unlikely that your anti-sway bar is loose, or your springs arent seated correctly.

Inside shocks are little valves, and sometimes the full test of bouncing the vehicle up and down will seat the valve, but the vibration caused by a small bump isn't enough to make them seat.
I'd say to replace them first, and go from there.

Also have a mechanic check the CV joints, and axel shafts.
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Sunday, July 22nd, 2007 AT 12:55 PM
Tiny
RDBOEHMER
  • MEMBER
Dipweed, thanks for reply. I was tending toward shocks but can bad shocks expalin the randomness of this occurrance? A few weeks ago I test drove the jeep (it had been my wife's) hitting every bump I could find and nothing. It does seem to be occurring more frequently.
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Monday, July 23rd, 2007 AT 1:07 PM
Tiny
DIPWEED23
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Yes, it can be completely random, but if they aren't replaced soon, it is possible that the problem could be full time.
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Monday, July 23rd, 2007 AT 2:36 PM
Tiny
RDBOEHMER
  • MEMBER
Dipweed, thanks for your quick response. I did replace the front shocks last weekend but this did not solve the problem. Yesterday it re-occurred.

I was going around 50 mph and hit a bump. This is the second time it happened while I was driving and I believe that I got a good feel for what the jeep was doing. At first, there was a slight CCW rotation of the steering wheel. Then, before I did anything, it rotated CW. It did this (CCW-CW) a few times and then the front started shaking quit violently. Slowing down stopped the shaking.

Could this be the Steering Dampener, bearings, CV joint, or something else?
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Thursday, August 2nd, 2007 AT 9:33 AM
Tiny
DIPWEED23
  • MEMBER
Replace your steering dampener. It looks like a shock mounted between your frame and the steering linkage. It will stop the steering wheel turning when hitting a bump. Also check all bushings, and rubber in the front steering area. All should be in pristine condition. These are UTILITY vehicles, and if things aren't in tip top shape in the steering and suspention system will drive worse than any old truck you ever sat your rear in!
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Friday, August 3rd, 2007 AT 1:13 AM

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