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How much drivetrain play?

Mozzer

By Mozzer
in Troubleshooting & Recalls

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Mozzer Enthusiast

Mozzer

Posted
Posted

Hi,

 

I have had issues from new with the rear end knocking during a down shift at very light throttle, this seems to be a programming issue that GM can't be bothered to fix.

 

The knocking is gradually getting louder (77,000 kms on a 2014). With the truck parked in neutral I can rotate the driveshaft quite a bit and hear it ping at each end of the free play. I had the dealer check it & they said the backlash etc is in tolerance, of course. I don't believe they actually measured the backlash as that would have meant taking the cover off, draining oil etc & it wasn't there long enough to do that.

 

Any way of converting the allowable play into number of degrees rotation?

 

 

 

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  • 2 weeks later...
Mozzer Enthusiast

Mozzer

Posted
  • Author
Posted

Hi,
 
I have had issues from new with the rear end knocking during a down shift at very light throttle, this seems to be a programming issue that GM can't be bothered to fix.
 
The knocking is gradually getting louder (77,000 kms on a 2014). With the truck parked in neutral I can rotate the driveshaft quite a bit and hear it ping at each end of the free play. I had the dealer check it & they said the backlash etc is in tolerance, of course. I don't believe they actually measured the backlash as that would have meant taking the cover off, draining oil etc & it wasn't there long enough to do that.
 
Any way of converting the allowable play into number of degrees rotation?
 
 
 
Sent from my Moto X Play using Tapatalk
 
 

Also, oddly the ping noise at each end of the free play sounds like it is coming from the middle of the driveshaft. I'm guessing that's just the noise echoing down the shaft but??

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XSKIER Enthusiast

XSKIER

Posted
Posted
Take to a different dealer. Your ring and pinion are still under warranty.
That may be true, but I went through the same thing 7 years ago on my 07 AVY. They don't warranty noises, only complete failures. When I asked the dealer about my rear end clunk and whine they took their best tech off his job to go for a ride. His prognosis was that it was acceptable. Lucky for them my ring and pinion failed at 110k mi, and was a customer pay job.

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Paintor Enthusiast

Paintor

Posted
Posted

put rear on jack stands......Drop the rear axle cover, put some pry bar between ring an pinion teeth and throw tha witch in drive with traction control and stabyltrak turned off......take metal chunks and shove into housing and reattach cover....put fluid back in....

 

 

jesus .....your other option is rent a Uhaul silverado and swap the rear axle.....let them deal with GM a$$hatz.

Mozzer Enthusiast

Mozzer

Posted
  • Author
Posted

I really appreciate the innovative measures & it might come to that (the rental option is great).

I would still like to know how to estimate the backlash without stripping it down, they gave me the specs for backlash & if it is outside that they will deal with under warranty.


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