noise when traction slip

[Bambie]

I have an inquiry if any one with an 2018 gmc has ever had any noise when it is in 2 wheel drive and there is traction loss it sounds like a muffled grind. I have had 2 other trucks out and they don't do it . This noise started at 37000 km. It has the noise in 4wheel as well have to push it harder to get wheel slip but get the same noise. IT also acts like it's in 4 wheel lock when turning and the truck starts to jump

[HeySkippyDog]

Take the rear differential cover off and refill it with new fluid.

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[SILVER SLED]

What he said and make sure the fluid has limited slip friction additive or add it separately if it’s not in fluid.  

[Bambie]

If fluid not changed will it destroy the diff

[Bambie]

dealer keeps telling me it's my ABS pump, they say that the ABs pump is used for the traction control ,, thanks for your input

 

[diyer2]

IMO

Check for the right gear lube.

My 2012 G80 does not need limited slip additives. Can damage the clutches.

[JimCost2014]

1 hour ago, Bambie said:

dealer keeps telling me it's my ABS pump, they say that the ABs pump is used for the traction control ,, thanks for your input

 

Are you getting the ABS light on the dash when it is doing this? Or the CEL?

[Mozzer]

dealer keeps telling me it's my ABS pump, they say that the ABs pump is used for the traction control ,, thanks for your input
 

On this rare occasion the dealer might be right, my truck doesn't have a limited slip diff so it is very easy to have the traction control kick in. That does sound like the ABS so I'm guessing it brakes one or both wheels when it detects slip.

I also see the indicator light up in the dash when the tc kicks in.


2014, 5.3, 4x4, work truck

[Chev-mekanik]

4 hours ago, SILVER SLED said:

What he said and make sure the fluid has limited slip friction additive or add it separately if it’s not in fluid.  

Do NOT add any additive. This is a locker in these trucks not a limited slip. You will damage the clutches.

[Bambie]

10 hours ago, JimCost2014 said:

Are you getting the ABS light on the dash when it is doing this? Or the CEL?

no ABS light , traction light comes on turn traction control off still get the same noise

[Mozzer]

no ABS light , traction light comes on turn traction control off still get the same noise

Try spinning them again with traction control and stabilitrak off (hold down traction control button for 10 seconds below 30 mph). If it gets slightly sideways the stabilitrak brakes wheels too.

2014, 5.3, 4x4, work truck

[ftwhite]

If the G80 locker mechanism is broken it could produce this noise. It would happen in both 2x and 4x, and only engauge when traction loss. You might open the rear diff cover and check it.

[Mozzer]

Can you hear if the noise is coming from the front or back.

2014, 5.3, 4x4, work truck

[It's Tim]

15 hours ago, Bambie said:

 IT also acts like it's in 4 wheel lock when turning and the truck starts to jump

You'll damage the driveline (perhaps already have) if you use 4 Hi or Lo on pavement.

[Bambie]

7 hours ago, Mozzer said:

Can you hear if the noise is coming from the front or back.

2014, 5.3, 4x4, work truck
 

it sounds like the front,, can feel the vibration in the gas peddle