Shake or Vibration Issues

[sideoftheroad]

What were your vibration symptoms before the above correction? Speed? Where did you feel it? Did it feel like a tire out of balance?

Vibration was 75+ mph and felt like the truck was going to shake apart as soon as it hit 76 mph. Also had a clunk every single time I would let off the gas. Also would clunk anytime going from park to drive or any gear in between.

 

Truck also rode TERRIBLE. I would hit bumps and my little cubby thing in the center of the dash would pop open it rode so bad.

I mean rode BAD for a $45k+ Truck.

[OmahaBen]

When it's all said and done I'll probably be told operating within spec and sent vibrating down the road. If that's the case this will be the last GM product I purchase.

 

 

Keep pushing. They finally got approval on mine to pop the cover and check the backlash in my differential, they drove it and the pico meter and found it was out of spec. I did have to take it to another dealer.

 

We will see what happens. I have been given 4 different trucks as loaners. All being GMC 1500 2015 models and 3 of the 4 vibrated worse than my 2014. One was smooth as can be.

 

I can't see how GM can ignore this issue and keep truck customers. If you can feel a driveline vibration, pico meter or not something is wrong.

 

Update on the process. The second dealer that has had my truck checked the axles for runout on the axle ends, the backlash in rearend and the driveshaft for runout. None have any issues. They did check the backlash on every single tooth of the ring gear.

 

However I did hear from the service advisor today.

 

They did find that that preload on the pinion bearings is not correct. They said that they will probably end up rebuilding the rearend because there was almost no preload on the pinion bearings.

 

Also both of my rear shocks are completely dead.

 

We will see what happens from here...

 

To be continued....

[LongrangeLauber]

 

Update on the process. The second dealer that has had my truck checked the axles for runout on the axle ends, the backlash in rearend and the driveshaft for runout. None have any issues. They did check the backlash on every single tooth of the ring gear.

 

However I did hear from the service advisor today.

 

They did find that that preload on the pinion bearings is not correct. They said that they will probably end up rebuilding the rearend because there was almost no preload on the pinion bearings.

 

Also both of my rear shocks are completely dead.

 

We will see what happens from here...

 

To be continued....

Could cause pinion to push in and out thus creating multiple issues. Glad you found a good dealer

[BO TIE 1]

Check out this video on you tube,

https://www.youtube.com/watch?v=IEH-xRUaAos

 

I wonder how bad his vibes were before it twisted apart?

[OmahaBen]

Could cause pinion to push in and out thus creating multiple issues. Glad you found a good dealer

 

I am surprised with the bearing preload not being correct that the backlash was consistant all the way around the ring gear.

[OmahaBen]

Check out this video on you tube,

https://www.youtube.com/watch?v=IEH-xRUaAos

 

I wonder how bad his vibes were before it twisted apart?

 

I wonder if the vehicle rolled off a transport or something like that. It is odd the front of the drive shaft twisted like that.

 

Since it was bent on the front it seems to me that the power was applied from the rear. Like it rolled off and all of a sudden the wheels just stopped.

 

Who knows I am no physics specialist.

[OmahaBen]

.

Edited October 2, 2015 by OmahaBen

[abominable z71]

Ok so I just got my truck back after the 9th repair attempt and my vib is 80% cured. It's night and day from before I dropped it off. I'm noticing all sorts of differences the more I drive it.

According to the dealershop my pinion angle was at .3 ( assuming this is degrees?). They installed a leaf spring shim kit part #23469809 and a new driveshaft which corrected my pinion angle to 2.3 (again degrees???).

 

Still have the whine when I let off the gas which is probably the pinion bearing from the angle being off. Vibe has also moved from 75+ to between 40-55 mph.

 

I will say the shim kit for the leaf springs just about got rid of any clunking going on.

 

Going to consult with an attorney to see if we can sue.

 

Did they tip the pinion angle down or up 2 degrees? You should be able to see the shim between the spring and rear block probably about 3/16" thick on one end and comes to a point on the other , if the thick part of the shim is towards the front of the truck they tipped it down 2 degrees.

[Jesse Davidson]

How is everyone doing today?

 

Anyone been to the dealer this week, any earth shattering news?

 

I am scheduling Road Force balance at the shop I bought the tires at Monday.

 

It is getting colder out and it feels like the vibrations are getting worse.

 

I may be ready for the PICO meter soon.

I was actually going to ask something similar to this, I have felt like the vibrations in my truck aren't as bad in the cold and in rainy/ wet conditions. wanted to know if anyone has found this or anything similar to this. My vibration is always worse, when the temperature and or truck/ tires get warm, and it feels worse when the gas tank is low on fuel/ when I don't have much weight in the truck. I'm wondering is a softer set of shocks and a sway bar would help the issues. The whole temperature/ wet vs. dry/ weight thing is a little baffling though.

 

 

Update on the process. The second dealer that has had my truck checked the axles for runout on the axle ends, the backlash in rearend and the driveshaft for runout. None have any issues. They did check the backlash on every single tooth of the ring gear.

 

However I did hear from the service advisor today.

 

They did find that that preload on the pinion bearings is not correct. They said that they will probably end up rebuilding the rearend because there was almost no preload on the pinion bearings.

 

Also both of my rear shocks are completely dead.

 

We will see what happens from here...

 

To be continued....

BillC6 had the same thing found with his rear shocks... completely dead. I'm thinking that either GM is using unbelievably shitty parts, or there is something out of line in the rear end that is causing this. His was in a High Country.

[MBalck]

IF YOUR DEALER SAID THE VIBRATIONS ARE WITHIN SPEC TAKE YOUR TRUCK BACK ASAP!

 

With that being said I'll give you a quick back story. My 2015 z71 Sierra CC has been at the dealership for 60 out of 150 days this far. They've replaced front tires x 2, a set of rear tires, set of shocks, driveshaft, pulled ring and pinion to check specs and checked specs on every corner of the truck. POS still vibrates, even after being told that the truck was within specs after the PICO scope tests. Finally, as of yesterday, the GM Field Service EEngineer came and drove my truck with their new scope and it vibrated off the charts. The new scope checks vertical vibes, lateral vibes as well as forward and aft vibes. The GM limit is 10mg but they try to get the trucks to somewhere near 5-7mg. My truck with the new scope read 50MG!!!!!!!! TAKE YOUR TRUCK BACK AND DEMAND IT BE TESTED WITH THE NEW SCOPE!!!!

Just as i thought, there was and is still a bad vibration in the truck at anything over 65. Now comes the kicker, the FSE said they are going o replace the tires again, RF balance them then run the truck for 30 miles to get the tires hot. Once the tires are hot they are going to bring the truck back in and re-RF balance them. He said that should cure the vibes. Sounds like a huge crock of shit to me. Balanced is balanced is balanced, regardless if the tires are hot or cold!

[Jesse Davidson]

hahahaha, I don't believe a thing GM says anymore. Like I've said, I'm still super nervous about the '16's and GM only masking the issues.

[MBalck]

I am about to start my BBB claim in efforts to get money back. I'm buying a Tundra.

[Aaron1085]

Well I stopped into my local dealer today to thank the service manager for the assistance in battling with district manager and GM with me and to also get my 30 day check-up for the new truck.

 

Service manager states he has told GM and been advised the same, that the body and engine mounts need to be changed in order to quell most vibration problems. GM states they won't do so because then they have to redo crash testing and whatever else...I was shocked! I guess not really but to hear that come from his mouth and think of the 6 months / 1 year of WAR I went thru with my truck just floored me. I ran, they'd rather HOPE the issue doesn't arise than fix it properly. He also said since I've been in there, he has has a lot more trucks coming in for the same issue....

 

 

Sent from my iPhone

hahahaha, I don't believe a thing GM says anymore. Like I've said, I'm still super nervous about the '16's and GM only masking the issues.

2016's aren't changed at all; aside from cosmetics.

 

 

Sent from my iPhone

[4x4LJB]

I wonder if wheel size has anything to do with it.

 

I test drove a new base 2015 GMC Sierra, regular cab, 5.3 V8, 4x4 with stock steel 17" rims and tires.

 

Truck hopped like mad at 69-71 mph. Awful.

[MBalck]

It's not a wheel or tire issue. They replaced my factory 20's with a base issued set of 18's and the vibrations were still there and it added a lot of cab noise as well. These trucks have a serious issue.