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Old 04-01-2011, 05:57 AM   #1
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ive got a weird one...

--99 tj, 4.0L I6, 5 speed, 4" lift on 33X12.50s--

ok this is a bit of a weird problem (i think anyway), so the other day i had 4 ppl in my jeep and we were offroading and hit a pretty big rock (was the entire width of the jeep but only like 3" high at about 10-15mph, ever since then it has vibrates pretty bad from 40-50 mph, but only while im hitting the gas, and only when someone is in the back seat... if im by myself or only have 1 other person in it, it drives fine but as soon as i get someone in the back it does the vibration.. any help would be awsome, im going to bring it to walmart and have them balance the wheels this morning when they open to see if that will fix it

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Old 04-01-2011, 07:11 AM   #2
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If that doesn't do it I'd recommend an alignment. Hitting something that solid could very well throw your alignment off.

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Old 04-01-2011, 07:33 AM   #3
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i was thinking that but it still drives straight as an arrow, i can get it on the HWY and put it in cruise control and just let go of the steering wheel, i can go a good 3 miles without even touching it and it wont veer off in either direction
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Old 04-01-2011, 08:28 AM   #4
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alignment is not just about the car being pulled left and right. it can be how your wheels lean in or out at the top and how they lean forward or aft of the axle. you have three aspects, caster/camber/tow
you can have a car that does straight down the road but wears the tires uneven as they are different aspects of being aligned.
i think you hit the nail on the head with the tire balance, my first thought was a wheel weight fell off. you might want to also check and see if you slightly bent a rim.
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Old 04-01-2011, 08:49 AM   #5
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Bent rim is my first thought...check the tires carefully, and for giggles, get your tires rotated and get your spare into the rotation. As each tire comes off, watch for a thrown OR 'moved' wheel weight or a bend in the rim. With the vehicle jacked up, grab each front wheel at 9 and 3 position and try wobbling the tire...hard to do with a 4wd BUT if you get any play...you may have tie rod, ball joint, or bearing problem.
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Old 04-01-2011, 11:47 AM   #6
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Originally Posted by scgeek12 View Post
--99 tj, 4.0L I6, 5 speed, 4" lift on 33X12.50s--

ok this is a bit of a weird problem (i think anyway), so the other day i had 4 ppl in my jeep and we were offroading and hit a pretty big rock (was the entire width of the jeep but only like 3" high at about 10-15mph, ever since then it has vibrates pretty bad from 40-50 mph, but only while im hitting the gas, and only when someone is in the back seat... if im by myself or only have 1 other person in it, it drives fine but as soon as i get someone in the back it does the vibration.. any help would be awsome, im going to bring it to walmart and have them balance the wheels this morning when they open to see if that will fix it
broken tranny mount or bent drive shaft
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Old 04-01-2011, 11:54 AM   #7
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my first thought was drive shaft.. might do some good to crawl under the jeep and have a look at them
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Old 04-01-2011, 11:56 AM   #8
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while im not a jeep expert, keep in mind guys that his problem is varying based on load. i was inclined to think bent rim but that would be a constant as it spins. the same with driveshaft. tranny mount would fall into the same category. none of those things would be affected by having an extra person in the backseat. im not saying i have the exact answer, but lets consider the facts and not just throw stuff at the wall in the hope that something sticks.
tire balance would be affected since load is a factor in tire pressure, probably in the back from his description.
would additional weight affect a damaged rear sway bar or other rear suspension component?
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Old 04-01-2011, 12:00 PM   #9
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Is there any way it could have changed the pinion angle ( tweaked the axle)? Under load it squats the rear enough to start to bind it up hence the vibes. Sounds plausible to me !?!?
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Old 04-01-2011, 12:01 PM   #10
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The amount of weight would affect the driveshaft or tranny mount because the body would be closer to the axle which would change the angle of the driveshaft
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Old 04-01-2011, 01:53 PM   #11
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just got back from walmart, they balanced the tires, and filled them up, they were at 25psi each (forgot to fill them from last time i was offroading lol) so far so good, did about 65 miles with someone in the backseat! thanks for all the input!
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Old 04-01-2011, 04:02 PM   #12
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so it was the low tire pressure or the balance? hrm...
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Old 04-01-2011, 04:57 PM   #13
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not sure which it was got them both done at the same time, perhaps a combination of the 2, either way it seems to be fixed lol, so far..

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