Shake or Vibration Issues

[CounterMeasure]

 

Does it Goodyear SRA tires ?

 

No, Bridgestone Duelers.

[pm26]

Dealer gave me a '15 Sierra access cab 2WD Z71 to drive as a loaner while they let my Denali sit in their service department because they only have one tech that can diagnose tranny noises, and today he went home early. That aside, holy moley does this loaner vibrate. Around 55mph, its unbearable, smooths out a bit until you hit 70mph and then I worry its going to come apart.

 

I thought my original tire related vibration was bad, but its nothing compared to this one. I have a new level of sympathy for you guys chasing your vibrations. May your future miles be smooth as glass.

 

 

 

It cannot possibly vibrate. This condition is so rare that only those with a severe case of OCD notice it.

Edited February 3, 2015 by pm26

[findingnewvibratingroads]

I have read many of your comments, and I've decided to join the conversation.

 

I hesistantly traded my (new body style) perfectly operating 07 Silverado for this ALL NEW 14 Silverado in May. I noticed to vibration immediately during the test drive but the salesman assured me that it was a result of flat spots caused by sitting on the lot.

 

As a result of reading this forum, I decided to take it in 2 weeks ago to have this rhythmic vibration crap diagnosed. It has now been at the dealer for 2 weeks and 2 days.

 

I have been told that they recently received a machine that pinpoints the origin of the vibrations. This machine led them to inspect the rear end. The guy told me that one of the gears in the rear end was "ground backwards" from production. How does that happen?

 

Anyways, they are now replacing this gear. I'm very curious to see if this solves the problem. I have been a Proud Chevy man , like my daddy, since I was a kid. It's in my blood. However, this issue has put I very very bad taste in my mouth.

 

I was annoyed after I got my "American" made truck home and noticed it was manufactured in Mexico. Now, it rattles my teeth out. The cherry on top is the fact that Chevy released 2015's with the same issue. I am EXTREMELY disappointed in Chevrolet, and I really do hope my truck is fixed when I get it back.

[RyanbabZ71]

"Ground the gear backwards"

 

Interesting not sure how the rear end would even function

 

 

Ryan

[KARNUT]

I don't how they wouldn't be howling like crazy, I've change my share of gears, if your off they get pretty loud. I'm not an expert I guess anything possible, I can see a misalignment in the housing or lose bolts. Internal gear problems would tend to make noise that would be hard to miss.

 

 

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[pm26]

I replaced worn metal gears in the gearbox of one of those Kitchenaid batter mixers (a 6 quart model). One of the replacement gears they sent me had a wrong pitch on the teeth to match with the drive gear on the motor shaft. After I carefully assembled everything and generously greased the gears, I turned the machine on. I heard this horrible high pitched whine, which immediately alerted me that something is very wrong. Sure enough, after I got the right gear and installed it, everything was nice and quiet immediately. Just a little example to illustrate that even when small size gears are mismatched, there will be a lot of noise associated when they start turning at full speed.

Edited February 3, 2015 by pm26

[pm26]

The guy told me that one of the gears in the rear end was "ground backwards" from production. How does that happen?

Made in Mexico, China, etc., with nonexistent milling machine operator training and nonexistent quality control. That's how.

Edited February 3, 2015 by pm26

[medicconnor]

Mines back at the dealer for the 4th time (900miles)

 

I am not sure what they are going to do, but they all agree there is a issue. They have been super helpful so far.

[pm26]

Mines back at the dealer for the 4th time (900miles)

 

I am not sure what they are going to do, but they all agree there is a issue. They have been super helpful so far.

Hopefully they will get it fixed the fifth time.

[sideoftheroad]

Just dropped mine off for the 5th and final repair and diagnoses attempt this time with a field service engineer. The loaner they gave me has The same vibration that mine does but it's way worse. My service advisor told me that it shakes so bad they can't sell it. 2015 lt z71 crew cab 4x4 2100 miles. Shakes from about 35 on.

Edited February 3, 2015 by sideoftheroad

[pm26]

Just dropped mine off for the 5th and final repair and diagnoses attempt this time with a field service engineer. The loaner they gave me has The same vibration that mine does but it's way worse. My service advisor told me that it shakes so bad they can't sell it. 2015 lt z71 crew cab 4x4 2100 miles. Shakes from about 35 on.

What bothers me about this is that the shaker is a 2015 model. Which means that GM has installed the same defective parts in the 2015 trucks. I will not even consider buying a 2015 GM truck at this point. I have been following this thread closely, looking for a confirmed and positive resolution of this issue. I guess I am wasting my time.

Edited February 3, 2015 by pm26

[pm26]

I don't how they wouldn't be howling like crazy, I've change my share of gears, if your off they get pretty loud. I'm not an expert I guess anything possible, I can see a misalignment in the housing or lose bolts. Internal gear problems would tend to make noise that would be hard to miss.

 

 

 

Your diagnosis is correct. Gears machined wrong and meshing improperly would make horrible high pitched whine and would get ruined very quickly.

[RyanbabZ71]

Made in Mexico, China, etc., with nonexistent milling machine operator training and nonexistent quality control. That's how.

Gears are normally shaped or hobbed and then ground. I have a little experience in gear manufacturing and never seen one "backwards". Incorrect pitch yes, involute, yes, never backwards. I think their diagnosis / explaination was off a little

 

 

Ryan

[findingnewvibratingroads]

Gears are normally shaped or hobbed and then ground. I have a little experience in gear manufacturing and never seen one "backwards". Incorrect pitch yes, involute, yes, never backwards. I think their diagnosis / explaination was off a little

 

 

Ryan

Thanks! I'm still waiting to hear back from them. I will update at that time.

 

Does anyone expect this new gear to correct the issue?

[pm26]

Gears are normally shaped or hobbed and then ground. I have a little experience in gear manufacturing and never seen one "backwards". Incorrect pitch yes, involute, yes, never backwards. I think their diagnosis / explaination was off a little

 

 

Ryan

I do not know exactly what they meant by backwards either. It is clear however, that the gear/axle supplier to GM has cut the quality control to a bare minimum and is most likely using poorly trained personnel to assemble the differentials. Helical ring and pinion differential gears, because of their geometry develop forward thrust. Therefore it is imperative to preload the pinion bearings correctly and to properly torque the pinion nut. if the pinion shaft is loose, the pinion gear can exert excessive loading on the ring gear, causing rapid tooth wear and possibly vibration.