2017 GMC Sierra Vibration at High Speeds

[Hexa Fox]

Hey guys so a lot of you probably know I just recently purchased a new truck. So far I have been very happy with the upgrade overall. However, I noticed that when getting up to highway speeds 60+ MPH and can be felt especially at 70+ MPH the truck shakes, I would describe it as more of a 'bouncy' feeling. I would also say it is mainly felt between 65 and 75 MPH. I think it keeps doing the same thing as you increase in MPH but have not had a good place to really see. It could just be in my head but I am thinking it is getting worse too. I have not done any mods to the truck either. Not sure about the previous owner. I know he got an under truck coating, unless it came from the factory like that. I am thinking maybe some of it could have gotten on the differential and now throwing the trucks ride off a little?

 

Things Done:

1.) Truck has had front end alignment.

 

2.) Truck has had a "road force balance" by a GM certified piece of equipment.

 

Things Noteworthy:

1.) The GM dealer yesterday told me that the new General tires that GM is putting on their trucks are not quality tires. He said upgrading would definitely make a difference. However, he also said that the "road force balance" would resolve my issue too, and it has not.

 

2.) He said that in 2014 GM moved there trucks from the open "C" and went back the the closed "box" frame. He said this decreases ride because there is less play. I had no issues like this in my 2007 Silverado, it literally rides like a modern sedan. 

 

 

So any advice would be greatly appreciated, I know that the recommended PSI is a few off according to the computer in the truck. I think both fronts are 38 and one in the back is like 35 and the other is like 36 I believe. I know it is important but do not think it could cause this. Next thing I am looking at for sure. I remember reading somewhere that it is important to do something different with air pressure in the Winter versus the Summer. I remember reading this a couple different places but cannot remember what it said, I think it said it was especially important for trucks though. So let me know what you guys think.

[Ianwelch001]

You may want to search Chevy shake on these forums it is a common problem with this body style. Also as far as I know GM does not use general tires on its trucks but I could be mistaken the trucks I have have always come with Bridgestone tires

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[Snowcamo]

Its likely due to a tire or two being out of round. If you do your reviews on general tires you'll see a bit of out of round complaints. Take the truck elsewhere like discount. Have them put it on the road force and watch the tire tread on the balancer. Look at the face of the tread as it spins. Does it zig zag left and right? Look at the tire from the side. Do you see an up and down movement? I've delt with this recently and feel your pain. The road force can only do so much. It can do nothing for an out of round tire though. Even better have someone follow you down the highway. When you hit 70mph ask them which tire is shaking badly. I really hope you get this resolved.

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[Snowcamo]

@TEXASGEEK

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[aseibel]

38 minutes ago, Hexa Fox said:

I remember reading somewhere that it is important to do something different with air pressure in the Winter versus the Summer.

Colder air is more dense, so you need to add air in the winter when the first real cold snap hits. say you keep them at exactly 35 psi all fall. Then one day its zero degrees out, your tires will feel squishy since the air has contracted and now only have like 28 psi in them.

 

Generally they leak air very slowly so you probably don't need to let air out before summer, but if you have them at 38 psi in winter (like you said they are now) and all of a sudden it its 90 degrees on you, you will have a bouncier ride because the tire pressure will be up over 40 psi.

[lonestardiver]

Actually cold air is more dense.

Since the temperature is lower the air molecules are less active (excited) and the pressure drops. The quantity of air (by mass) is the same. For those that remember high school chemistry think back to Boyles law about temperature, pressure, and volume. When you reduce temperature you need to decrease volume to maintain pressure.

[Hexa Fox]

Just now, lonestardiver said:

Actually cold air is more dense.

Since the temperature is lower the air molecules are less active (excited) and the pressure drops. The quantity of air (by mass) is the same. For those that remember high school chemistry think back to Boyles law about temperature, pressure, and volume. When you reduce temperature you need to decrease volume to maintain pressure.

Either way this was it, I remember now. 

[aseibel]

2 minutes ago, lonestardiver said:

Actually cold air is more dense.

you got me. Its more dense, resulting in less pressure. I'll fix my statement so as not to confuse anyone.

[Hexa Fox]

33 minutes ago, Ianwelch001 said:

You may want to search Chevy shake on these forums it is a common problem with this body style. Also as far as I know GM does not use general tires on its trucks but I could be mistaken the trucks I have have always come with Bridgestone tires

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Yeah I did do some of my own research before posting. It looks like it can literally range from everything. The dealer that I was just at had General tires on the new GMC trucks. The dealer told me that GM got a really good deal with them to buy them by the millions or something. So he said expect to see a lot more of them in the near future. He  said there was no doubt that my truck came standard with them as well. 

[Hexa Fox]

28 minutes ago, Snowcamo said:

Its likely due to a tire or two being out of round. If you do your reviews on general tires you'll see a bit of out of round complaints. Take the truck elsewhere like discount. Have them put it on the road force and watch the tire tread on the balancer. Look at the face of the tread as it spins. Does it zig zag left and right? Look at the tire from the side. Do you see an up and down movement? I've delt with this recently and feel your pain. The road force can only do so much. It can do nothing for an out of round tire though. Even better have someone follow you down the highway. When you hit 70mph ask them which tire is shaking badly. I really hope you get this resolved.

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Thanks man me too. You did see where I said that they already put it on a road force balance machine already right? Just clarifying, you want me to watch it myself? 

 

Also you mean you have dealt with the General tires? The dealer readily spoke badly about them, he said they were not a quality tire by any means. 

[Hexa Fox]

So this dealer, told me that it is normal for these new trucks to vibrate a little at higher speeds. He said they can literally spill drinks it gets so bad sometimes. This does not sound right to me. Anyone else know anything about this? 

[Snowcamo]

Thanks man me too. You did see where I said that they already put it on a road force balance machine already right? Just clarifying, you want me to watch it myself? 
 
Also you mean you have dealt with the General tires? The dealer readily spoke badly about them, he said they were not a quality tire by any means. 

Yes I read that. Hence reason why they suggest upgrading will solve your issue. Not general it was another brand. However i looked into general as a cost effective solution. Not going that route and the issue your having is why.

Iirc the road force has a scale of 1-80. 40 being the peak a decent balance. You need to be in front of a tech balancing your tire to see this or they will pass it off. Unless you ask specifically at another place. You will need to have your eyes on the machine and tire. Discount will vouch for you in reguards to tires being out of round or not being within the tolerance. You want that number(whatever its called) to be 25 or below and then you'll feel a big difference in your ride.
been there...

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[Snowcamo]

So this dealer, told me that it is normal for these new trucks to vibrate a little at higher speeds. He said they can literally spill drinks it gets so bad sometimes. This does not sound right to me. Anyone else know anything about this? 

B.s. bro

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[Nanotech Environmental]

37 minutes ago, Hexa Fox said:

So this dealer, told me that it is normal for these new trucks to vibrate a little at higher speeds. He said they can literally spill drinks it gets so bad sometimes. This does not sound right to me. Anyone else know anything about this? 

I disagree with the dealer. I also have a 2017. With the stock Bridgestones, there is no issue. When I put my duratrac/steelies on for the winter, I get a slight shake in the steering wheel at about 70 & it goes away by 80mph. 

When dealers say stuff like that, it's because they don't know how to address the issue. Get a better dealer.

[Hexa Fox]

6 hours ago, Nanotech Environmental said:

I disagree with the dealer. I also have a 2017. With the stock Bridgestones, there is no issue. When I put my duratrac/steelies on for the winter, I get a slight shake in the steering wheel at about 70 & it goes away by 80mph. 

When dealers say stuff like that, it's because they don't know how to address the issue. Get a better dealer.

Yeah so luckily he is not where I purchased the truck from. The problem is the dealer where I did purchase the truck from is about an hour and a half drive. I did consider this when purchasing the truck. 

 

He charged me almost exactly $100.00 to do the road force balance. He absolutely positively guaranteed me that it was going to resolve my issue. The dealer I bought it from is pretty cool, they said to send them the receipt and they would reimburse me for it. I think I am going to wait to get reimbursed and then tell them about this and let them decide. By the way I have a dash cam in my truck, the guy driving it never took it above 50 MPH, which I thought was pretty crappy.  These tires definitely have some tread left. 

 

I forgot to mention that I still have my old truck and put a really nice set of Michelin Defender LTX's on it last year. I was thinking about swapping to them and seeing if it made a difference but the first number on the tire is different. The new truck has 255's and my old truck has 265's, not sure if that will make a difference or not.