Drive train vibration

[asaxby]

• • Hey guys desperately looking for help!! I took my truckand put 20” Moto wheelsand General graber At2 tireson it. The tireswould not fit in the front wheelwells so I put BDS leveling keysin and a 1” block in the back so it still had a little rake. I have been chasing a vibration in the trucksince. The vibration only starts at 70 mph and up! I have had the tiresroad force balanced ... spun the tireon the wheeland all that Jazz. I then took the drive shaftoff and they check it and the U joints for trueness and balance, it of coursechecked out perfect. After I am somewhat confident it is not the tiresanymore or the drive shaf I took it to Chevyserviceto get the paper trail started. I was told today by Chevythat because I put a ”lift” in it that they would not check it out or diagnosis the problem. However, they speculate since I put the liftin it it changed the angle at which the drive shaftspins hence probably causing the vibration!! They are not willing to do anything thing else with it until I put it back stock. I unfortunately don’t have the stock wheelsand tiresthat came with it so I can do that. Plus if I take the leveling kitout my front tiresrub. I love the dieseland look of the truck, but I can’t deal with this vibration. So I need HELP any suggestions ????? THX guys in advance!!

     

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    heymccall

    Diesel LegendJoin: Feb 2005Posts: 17171Monroeville, PA USA

    

     

     

     

     

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    Ron Nielson

    Diesel ChampJoin: Aug 2009Posts: 1894Berryton, KS

     

     

     
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    asaxby75

    online

    Gear GrinderJoin: Oct 2017Posts: 2Upstate NY

     

     

     
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  heymccall

  Diesel LegendJoin: Feb 2005Posts: 17171Monroeville, PA USA

  

   

   

   

   

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  Ron Nielson

  Diesel ChampJoin: Aug 2009Posts: 1894Berryton, KS

   

   

   
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  asaxby75

  online

  Gear GrinderJoin: Oct 2017Posts: 2Upstate NY

   

   

   
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[CRApex]

What's vibrating?  The seat, steering wheel or both?

 

My 2017 passenger seat vibrates after 70mph on certain roads, seems to come and go as it pleases.  Steering wheel is smooth as silk.  I have a readylift installed in the front, installed by Chevy dealer.  The dealer looked at my truck and thought something in the rear underseat storage box was causing the vibration, I emptied it and it made no difference.  I noticed when I picked my truck up at the dealer they had the passenger seat all the way back and that helped but hardly a "fix".

[gearheadesw]

I think our driveshafts aren't balanced vary well, and that's why we don't all get it. Feels like it's right under my butt, right where the transfer case and driveshaft connect.

[asaxby]

My vibration shakes the whole truck, but is not coming from the steering wheel at all. I had a drive line shop check my drive shaft for  Trueness and balance ... it checked out perfect! 

[avalonandl]

Its the tires IMHO. General Grabbers are not that great. Wheels may be culprit too.

[asaxby]

 

Gear Grinder   Join Date: Oct 2017 Location: Upstate NY Posts: 3

Update : I took the truck to my military base with just over 500lbs in the bed. I also lowered the tire pressure a bit to test the pinion angle theory, as the drive shaft may be at a bad angle. Unfortunately the weight and lowering of pressure didn’t seem to make a difference ‘ the truck shook just as bad as it did with no weight. Update you guys after my appointment on Tuesday. My question is when a shop has a road force balancer able to do larger tires will it tell if the tire is bad ? How about the wheel.

[avalonandl]

Put the truck back to stock is the other choice.....

[asaxby]

 

Gear Grinder   Join Date: Oct 2017 Location: Upstate NY Posts: 3

I was able to get it figured out ... they road force balanced it and found two of the tires were bad!

[avalonandl]

Glad you figured it out. Like I said General Grabbers are not great tires.

[Barak]

Hi everyone. I am not sure if my issue is similar, related to drive train vibration or tires, but once I am at 73-75mph, I tend to feel it little especially in rear seats and passenger seat. Just picked up the truck over 2 weeks ago, now with 650 miles on engine. Wasn’t being sure of tires and balancing. Took it back to dealership, had them road force them (stock tires/rims), kind of saw a little improvement on rear seat vibration, but still passenger seat tends to have it and now front end seems to be picking up too. I hope it’s the tires and balancing as I am not a fan of dealership’s technicians doing it. Almost feel like I should take it to a place that specializes in tire installs, places with 30+ years of experience and seasoned technicians. I do get that it’s a machine thing, but I also feel like there is some technician experience thing to it too. And not sure if I continue sticking with the dealership or try other specialists due to warranty thing. So, any feedback/direction is much appreciated.  Thanks!