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shaking front end


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Anonymous Poster
luvmymutz@yahoo.com

Jun 3, 2008, 9:07 AM

Post #1 of 5 (968 views)
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shaking front end Sign In

So, I have had a problem with me 2004 Jeep Grand Cherokee shaking ever since I started putting new tires on. I'll start from the beginning...I put 2 new tires on the front about 1 1/2 months ago. The Jeep is full-time 4WD and I've since been told that I should've done all 4 at once. About 2 weeks after the new tires were put on the front, the vehicle started shaking once I hit 25-30 mph. So, I had 2 tires put on the back. This helped tremendously, but the vehicle still shakes. It is getting more noticeable day by day. It goes down the road straight so alignment doesn't seem to be an issue. I had a mechanice look at it and he says that the U joints look great, everything looks great. He can't understand it and suggested that I go to a Jeep dealer to have it looked at. Before I pay the Jeep service place, I can't help but wonder if it could be a bad tire or it just needs to be balanced again. I know they do this when they change tires but with the 4 being put on at different times, could I have damaged something else? Please help me avoid paying too much for someone to tell me they don't know what it is!


Tom Greenleaf
Ultimate Carjunky / Moderator


Jun 3, 2008, 10:05 AM

Post #2 of 5 (963 views)
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Re: shaking front end [In reply to] Sign In

At a minimun the tires and wheels on an axle must match and better with AWD if all match - including degree of wear.

Do you now have four new tires or did you just move them?

In that it took some time to show up it could be a defective tire. 25mph or so is a bit slow for balance to cause an issue but tire trueness counts at all speeds. Driving a new out-of-balance tire too far can wear it such that it won't be so true if balanced later. Kind of like you could balance an egg to spin end over end but it wouldn't roll well---------

T
_________________________________________
Long retired now


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Anonymous Poster

Jun 3, 2008, 12:26 PM

Post #3 of 5 (960 views)
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Re: shaking front end [In reply to] Sign In

Thanks for your help. I did drive it quite a bit for 3 weeks or so before I had 2 new tires put on. So, I guess I should start with having the guy balance my tires again and see if that helps? Would you suggest switching them around also?


Tom Greenleaf
Ultimate Carjunky / Moderator


Jun 3, 2008, 1:32 PM

Post #4 of 5 (959 views)
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With all mechanical problems ruled out and this seemed to start right with the tires the first time I would have them (tires and balance) checked again. Off vehicle on the balancing machine a defect might show itself better than on car observations.

In a short amount of miles the tires may show a wear pattern that is the clue and should be removed from the rim for further inspection.

If nothing is found an alignment or recheck of that is indicated and when tires are inspected I'd put fronts on rear noting what was found.

Again - balance really doesn't come into play at lower speeds and unless they needed a lot of weights and perhaps fell off it's interesting why it waited a couple weeks to show any problem. That would be about (guess) what a defective tire might take to show up. Tires have been recalled since the beginning and surely you've heard of that. The common reason is treads (vulcanized belts) usually separate and may make a bubble to see or a soft spot while it's rolling along that will wear diffferently. The problems you hear about are when folks ignore problems and drive like maniacs anyway with them till rubber starts falling off IMO. Relax about that but pay attention.

Also, wheels must be true and they must mount on vehicle true. Hmmm - some vehicles with some rust especially get rust between rotors and the hub. When wheel is removed for any reason many rotors are a bit loose being held on by the caliper and may stick to wheel just a bit and rock when taking the wheel off. If rusted behind rotor's center contact and the hub, flakes can fall down and when wheel is put back on it will tighten up but isn't sitting true to the hub. That's happened several times to me and to customers who just changed a flat and the problem started. If the balance and trueness of the tire and wheel together checks out then when put back on you would spin it and see if it's off - wobble if you feel it would show right up then.

If that has happened all rotors (drum brakes didn't do that as much) should be removed and scraped clean.

That's happened to me when just rototing wheels around for a customer and they know something is wrong right away and come right back. Because of that I take extra care to check before a vehicle leaves that is a bit rusty that it spins true.

That problem can escape notice by techs with no mal intent - it can just happen and many will be wary of the possibility when the first one catches them. That's a rust/corrosion problem and if cars are real clean I've never seen that happen. It also shows up right away even at low speeds.

Hope that helps. It's funny but even what seems so simple to just get new tires or just rotate them can become a test of one's mechanical savy,

T
_________________________________________
Long retired now


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Anonymous Poster

Jun 4, 2008, 10:50 AM

Post #5 of 5 (950 views)
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Again, I thank you soooooo much for your advice. I have an appointment at a local place this week. I have printed off your advice and will share it with him. I also mentioned it on the phone; stating that it is advice and I don't second-guess his work (I don't want to irritate the guy before he works on me vehicle Mad). I'll let you know how it goes!




shaking front end


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