Shake or Vibration Issues

tnchevy · September 7, 2015

Have you not read any of this thread?

tmkilburn · September 7, 2015

Have you not read any of this thread?

I read a majority of it. Didn't look promising.

C6Bill · September 7, 2015

Some have been fixed, some have been improved and others have shown no improvement at all. And worst case scenario the dealers have refused to help at all. I'm glad my dealer is not in that category, they have been great throughout this process.

Jesse Davidson · September 7, 2015

I read a majority of it. Didn't look promising.

Unlike Bill, I've had no luck with anyone My dealer won't do anything because Government Motors told them not to, I've called & emailed GM and they say that theres nothing they can do. I'm preparing to sue.

abominable z71 · September 7, 2015

I was told they can see the vibration on the pico scope but its below the GM spec so there is nothing they can do. Les schwab has been more help than the dealer or GM. They have put 2 sets of wheels and 7 different tires got the road force down to 7 lbs on 3 tires and 0 on one tire. Still a vibration at 70, I know for a fact it is somewhere in the drive train, ring and pinion, slip yoke or maybe front cv shafts or combination but not the tires. I've bought gear oil and everything I need to open the rear end and take some measurements. I read on a different forum that 14's and early 15's made in mexico have slightly bent axels from when they were strapped down during shipping. I'd like to pull the front CV shafts and see if that eliminates the vibe but unfortunately they hold the front hubs onto the spindles. Maybe 2wd drive spindles will fit a 4x4 but not really an investment I want to make to try it out, especially since some 2wds have the same vibes, unfortunately different fixes work on different trucks so it could possibly by cv shafts on 4x4s where none of the other attempts have yielded any results. I haven't seen anyone on here with a 4x4 mention replacement of the front half shafts to try and fix the vibe.

MBalck · September 7, 2015

Abominable z71- funny thing is the SM I'm dealing with doesn't think it's in the front end either. That's the only end of the truck they haven't had apart yet. I'm thinking either the front driveshaft, cva, or upper and lower a-arms are bent. Tomorrow is visit number four, and number three within the last 2 weeks. Hopefully the dealership and GM does me right.

abominable z71 · September 7, 2015

Abominable z71- funny thing is the SM I'm dealing with doesn't think it's in the front end either. That's the only end of the truck they haven't had apart yet. I'm thinking either the front driveshaft, cva, or upper and lower a-arms are bent. Tomorrow is visit number four, and number three within the last 2 weeks. Hopefully the dealership and GM does me right.

Vibrations in the steering wheel are typically from the front however some report that steering wheel vibration going away after replacing the rear end. Which is odd. When it comes to the front end the rotating parts that could be the source. Wheels and tires, hubs, rotors, front cv shafts. The front drive shaft from the tcase to the diff doesn't spin while the truck is in 2 wd, but the cv shafts are always spinning, I miss the days of locking hubs, that could eliminate some of the front drive sources. I've considered the aluminum arms on these trucks being too light and transmitting vibrations that might be damped by steel arms doesn't seem likely though. I've given some thought to replacing the upper control arms with a steel ball joint version from Fabtech that they use with their 4 inch kit. It would help articulation and ball joint angles considering I have a leveling kit but I wouldn't be to hopeful with the vibrations being improved.

Jesse Davidson · September 8, 2015

I was told they can see the vibration on the pico scope but its below the GM spec so there is nothing they can do. Les schwab has been more help than the dealer or GM. They have put 2 sets of wheels and 7 different tires got the road force down to 7 lbs on 3 tires and 0 on one tire. Still a vibration at 70, I know for a fact it is somewhere in the drive train, ring and pinion, slip yoke or maybe front cv shafts or combination but not the tires. I've bought gear oil and everything I need to open the rear end and take some measurements. I read on a different forum that 14's and early 15's made in mexico have slightly bent axels from when they were strapped down during shipping. I'd like to pull the front CV shafts and see if that eliminates the vibe but unfortunately they hold the front hubs onto the spindles. Maybe 2wd drive spindles will fit a 4x4 but not really an investment I want to make to try it out, especially since some 2wds have the same vibes, unfortunately different fixes work on different trucks so it could possibly by cv shafts on 4x4s where none of the other attempts have yielded any results. I haven't seen anyone on here with a 4x4 mention replacement of the front half shafts to try and fix the vibe.

Where did you hear about the axles on the mexico plant trucks being bent? My truck is a late 14 CC 4x4 from Mexico, maybe that could be part of my problem? My rough idle according to the TSB should be fixed with a new high flow exhaust system specifically something to do with a cross causing resonance & back pressure in the cat. other than that, I'm still at a loss on my truck.

pm26 · September 8, 2015

A few more things to watch out for when balancing wheels:

Chrome clad wheels or any wheel with some cladding on it should never be balanced with a an outer cone centering the wheel. The reason for that is that the cone may catch on the cladding itself and not center the wheel itself properly. Outer coning is not good method at all, even for plain steel and aluminum wheels. Make sure they center the wheel with a cone on the inside of the wheel and use a rubber lined pressure cup speed nut on the outside. Ideally, flange plates that hold the wheel by the lug nut holes on outside should be used for even more accurate balancing.

Sometimes it is necessary to use low taper centering cones, or even collets for centering the wheels. I still suspect that improper balancing accounts for at least some percentage of persistent problems here. Just because the balancer has road force measurement capability does not mean that the operator can get away with mounting the wheel improperly on the machine. If he does, you get improper balance and meaningless road force variation numbers.

Things that can cause improper balancing results:

1. Machine not secured to the floor properly or mounted on porous surface.

2. Improperly calibrated balancer or machine not calibrated for a long time.

3. Use of improper wheel centering techniques and/or hardware

4. Entering wheel parameters wrong into the machine

5. Balancer flange or threaded shaft not secured properly to the main shaft

6. Bent main shaft, damaged flange, or damaged threaded shaft.

7. Motor drive belt (if not direct drive machine like Coats) excessively loose

8. Use of poor quality centering cones and other hardware. Yes, centering cones must be machined to very high tolerances and be properly hardened to work correctly. When in doubt, ask for Haweka brand. Most American or German made cones are good quality, stay away from Chinese junk.

Edited September 8, 2015 by pm26

abominable z71 · September 8, 2015

Where did you hear about the axles on the mexico plant trucks being bent? My truck is a late 14 CC 4x4 from Mexico, maybe that could be part of my problem? My rough idle according to the TSB should be fixed with a new high flow exhaust system specifically something to do with a cross causing resonance & back pressure in the cat. other than that, I'm still at a loss on my truck.

http://www.silveradosierra.com/transmission/2014-2015-k2xx-vibration-buyer-beware-t404914-20.html

Read the post by HighCountry55 on June 05 2015 2:14 pm

abominable z71 · September 8, 2015

Jesse I've searched so many things and looked at so many different forums rearding these vibration issues I can't keep them all strait anymore. I came across one kind of smaller forum deep in the google search pages that I have been trying to find again where the OP said someone from the dealership "accidentally" left a piece of paper in his truck after numerous service attempts. The paper was supposedly a memo from GM circulating around about the vibration issues and known causes that they are remaining tight lipped about. I really wish I bookmarked it now. The OP said he would send a copy to anyone who wanted to see it. But it is the internet so you know the veracity of things on here. If I come across it again I'll make sure to get the link to you for your case.

14silverado4.3 · September 8, 2015

Jesse I've searched so many things and looked at so many different forums rearding these vibration issues I can't keep them all strait anymore. I came across one kind of smaller forum deep in the google search pages that I have been trying to find again where the OP said someone from the dealership "accidentally" left a piece of paper in his truck after numerous service attempts. The paper was supposedly a memo from GM circulating around about the vibration issues and known causes that they are remaining tight lipped about. I really wish I bookmarked it now. The OP said he would send a copy to anyone who wanted to see it. But it is the internet so you know the veracity of things on here. If I come across it again I'll make sure to get the link to you for your case.

AB, it is actually in the link you provided on page 4, Jul 1st post 310AM.

I would actually like to see that Bulletin also.

Jesse Davidson · September 8, 2015

http://www.silveradosierra.com/transmission/2014-2015-k2xx-vibration-buyer-beware-t404914-20.html

Read the post by HighCountry55 on June 05 2015 2:14 pm

Jesse I've searched so many things and looked at so many different forums rearding these vibration issues I can't keep them all strait anymore. I came across one kind of smaller forum deep in the google search pages that I have been trying to find again where the OP said someone from the dealership "accidentally" left a piece of paper in his truck after numerous service attempts. The paper was supposedly a memo from GM circulating around about the vibration issues and known causes that they are remaining tight lipped about. I really wish I bookmarked it now. The OP said he would send a copy to anyone who wanted to see it. But it is the internet so you know the veracity of things on here. If I come across it again I'll make sure to get the link to you for your case.

thats good info, and intersting... no idea how I would be able to check that, but good to know nonetheless.

AB, it is actually in the link you provided on page 4, Jul 1st post 310AM.

I would actually like to see that Bulletin also.

that would be correct, I just read it. here is a bulletin, I don't know if it is the exact one they specified.

http://oemdtc.com/6392/information-on-vibration-analysis-and-diagnostic-2014-2015-chevrolet-silverado-gmc-sierra

afireinside7444 · September 8, 2015

Called my local lemon law lawyer. He said they have had quite a few shakers 14 to 15s. Dident give me a specific number though. Getting him the info tomorrow to start the process

14silverado4.3 · September 9, 2015

Called my local lemon law lawyer. He said they have had quite a few shakers 14 to 15s. Dident give me a specific number though. Getting him the info tomorrow to start the process

So there are others!