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post #1 of 19 (permalink) Old 03-19-2011, 08:08 PM Thread Starter
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very bumpy ride

hi guys im new to this and i have a question, i just bought a used jeep commander 06, v8 3.7 about a week ago, and everthing seems fine except i feel it very very bumpy specially when there is several people in the truck,when im drivng alone its not as bad, its marking the tire pressure low so i put air in the tires but it still shakes when im driving at a steady speed, it is my first jeep so i may just not be used to it i drove a navigator before this vehicle, any ideas what it could be? thanx! =)
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post #2 of 19 (permalink) Old 03-19-2011, 08:22 PM
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Have you had the tires balanced ?

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post #3 of 19 (permalink) Old 03-19-2011, 08:58 PM
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Bumpy how? is it a soft constant up and down? Or is it hard bumps that get faster with speed? Getting more bumpy with weight in it leads me to think your springs and or shocks are worn/broken. Need more details on Bumpy. How much air did you put in your tires? Are they all at the same PSI? Like Jeep5253 said tires might need to be balanced?


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post #4 of 19 (permalink) Old 03-20-2011, 08:04 AM
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The 3.7 is a V6, not a V8. Is the shake like a shimmy? If so, it could be loose/worn tie rod ends. With just you in the Jeep, it would be noticeable, but when you add the weight of passengers in the back, some of the weight would be taken off of the front end, which would make the shimmy worse.
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post #5 of 19 (permalink) Old 03-20-2011, 06:00 PM
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How many miles on the vehicle?

Have you checked the shocks?

You added air to the tires, what pressure? and you made sure the pressure was exactly the same left & right?

Bumpy is usually associated with something, speed, road surface, going over bumps, etc...

Like mentioned, the 3.7L is a V6, the V8's were the 4.7L and 5.7L HEMI.


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post #6 of 19 (permalink) Old 03-20-2011, 06:19 PM Thread Starter
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oops i guess it is not a 3.7 but it is a v8, and no i havent had my tires balanced im gonna have to do that, the psi on all the tires is different so im guessing thats wat it could be after all and im gonna have the shocks checked too, the vehicle has 96,000 miles, but i did notice the shakin starts when im driving at 40 mph and it is not steady bumpy it does get faster, sal , thanks everybody!
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post #7 of 19 (permalink) Old 03-20-2011, 06:21 PM Thread Starter
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its a 4.7 i just checked lol
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post #8 of 19 (permalink) Old 03-20-2011, 06:57 PM
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Ok if the bump you feel gets faster with speed then not your shocks. I would guess a tire issue one of them might be out of balance. How old are the tires and have you had anything done lately to the jeep. I would have them rotated and balanced, the shop should correct all the tires pressure while doing this as well. I rotate my tires every 6k miles to keep them in good shape.


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post #9 of 19 (permalink) Old 03-20-2011, 07:19 PM
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Different tire pressure left and right can cause some vibration with speed that you can feel in the steering wheel.

Shocks you can check yourself push up and down on the bumper, get the vehicle going up and down as fast and as far as you can at one corner, then let go, it should stop with a single overshoot of less than 10% of the previous translation. More than that, the shocks aren't damping enough.

96,000 miles, likely shocks are worn some, unless the vehicle was driven on smooth roads only, worn out shocks can be a real possibility.


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post #10 of 19 (permalink) Old 03-20-2011, 07:23 PM
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Broken steel belts in a tire can cause this also. Been there, done that.
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