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New 3500 Sierra wobbling

alman

By alman
in Ask A GM Technician

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alman Enthusiast

alman

Posted
Posted

Hi,

 

I have a new GMC sierra 3500 (Dually) that has done only 3,500km on it. I have Rancho RS9000x on them and the suspension is great but the tires wobble like crazy when driving even on straight path. I noticed this after the installation of the Rancho.

 

I took it back to Rancho but they raised the truck and showed me the tires wobbling even when the truck was raised. The dealer replaced the tires but the wobble continues even when in the air (lifted on ramp).

 

Any one has any clue why this is happening?

mmmikkke Senior Enthusiast

mmmikkke

Posted
Posted

Ask your dealer what their spec is for tires to be considered "out of round". It's probably something like 1/16". So if you can see them wobbling, it sounds like they're out of round and another set of tires needs to be ordered.

alman Enthusiast

alman

Posted
  • Author
Posted
Ask your dealer what their spec is for tires to be considered "out of round".  It's probably something like 1/16".  So if you can see them wobbling, it sounds like they're out of round and another set of tires needs to be ordered.

 

 

 

 

 

Thanks for your response,

They did change the tires but they still wobble. In fact the wobble is so bad, it feels as is if the front is bouncing due to the wobble from the rear.

mmmikkke Senior Enthusiast

mmmikkke

Posted
Posted

Could you be talking about beam shake? Beam shake is the jiggling that you feel when driving on certain pavements. It seems like your front wheels go over a pavement joint, and you feel the bump and then a few aftershocks, and then your rear axle goes over the same bump and you feel a few aftershocks again.

alman Enthusiast

alman

Posted
  • Author
Posted

No actually, the truck drives very well on any abnormalities on the road because the ranchos do an excellent job. This is a wobble from the tires on a straight smooth highway. The same wobble can be seen when the truck is raised from the rear and driven on a ramp. It is identicle to the wobble you get from tires that have not been balanced

Draenor Senior Enthusiast

Draenor

Posted
Posted

Are the shocks mounted correctly? Or Are those the Ranchos that are adjustable? They could use more air to stiffen them up.

alman Enthusiast

alman

Posted
  • Author
Posted

they are adjustable and we tried all settings - stiff, soft medium

But when the truck is jacked up the shocks dont come into play, the tires wobble in the air

alman Enthusiast

alman

Posted
  • Author
Posted

I read a thread in a forum where someone had a major wobble problem after a tire change and solbed the problem by "removing the round clips on the studs that hold the drum" Check this thread on this forum

 

dont understand it, because I am not tehcnical on cars but this guy claims that doing the above solved his problem. Others responded saying that it worked for them too. In laymans language, What did the do?

 

Also see this link on someone else with a similar problem only his car was old and mine is new

Draenor Senior Enthusiast

Draenor

Posted
Posted

I know that could be true. On rear drum brakes they use self locking washers on the studs to keep the outer shell on. That would keep the tires mounted flush to the drum. I dont think that would help you on your dilemma. I not too familiar with the one tons. Are the wheels hub-centric? Are the wheels being mounted correctly on the truck?

alman Enthusiast

alman

Posted
  • Author
Posted
Are the wheels hub-centric? Are the wheels being mounted correctly on the truck?

 

 

 

 

dont understand the first question of the hub-cnetric

 

but on the second, how could the tire be mounted incorrectly, it seems like an easy task to me. I mean, what could go wrong the mounting?

dewfpo Senior Enthusiast

dewfpo

Posted
Posted
Are the wheels hub-centric? Are the wheels being mounted correctly on the truck?

 

 

 

 

dont understand the first question of the hub-cnetric

 

but on the second, how could the tire be mounted incorrectly, it seems like an easy task to me. I mean, what could go wrong the mounting?

 

 

 

 

 

 

If, when your replacing the wheel on the studs, run one nut all the way down with an impact gun, before installing any of the other studs to center the lugs in the holes, you could cause a slight imbalance of te wheel to the hub.

 

I recommend you remove and reseat the wheels on the hubs by snugging up at least two nuts by hand as far as they will go before tightening/torquing them all up.

 

DEWFPO

Draenor Senior Enthusiast

Draenor

Posted
Posted
Are the wheels hub-centric? Are the wheels being mounted correctly on the truck?

 

 

 

 

dont understand the first question of the hub-cnetric

 

but on the second, how could the tire be mounted incorrectly, it seems like an easy task to me. I mean, what could go wrong the mounting?

 

 

 

 

 

 

If, when your replacing the wheel on the studs, run one nut all the way down with an impact gun, before installing any of the other studs to center the lugs in the holes, you could cause a slight imbalance of te wheel to the hub.

 

I recommend you remove and reseat the wheels on the hubs by snugging up at least two nuts by hand as far as they will go before tightening/torquing them all up.

 

DEWFPO

 

 

 

 

 

:driving: the nail on the head

mmmikkke Senior Enthusiast

mmmikkke

Posted
Posted

I think it's possible the tires are just that bad, too. Seems hard to imagine that the dealer, or the tire dealer, put on all 4 tires incorrectly. Seems a lot more likely that all 4 tires are out of round.

alman Enthusiast

alman

Posted
  • Author
Posted
I think it's possible the tires are just that bad, too.  Seems hard to imagine that the dealer, or the tire dealer, put on all 4 tires incorrectly.  Seems a lot more likely that all 4 tires are out of round.

 

 

 

 

I agree, but I put on brand new Cooper ATR 305 70 R16 tires on the vehicle, then another new set.

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