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Auto 4wd noise?

pancepance
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BigBadSierra
BigBadSierra

Don't get confused between 4Auto and 4 hi and lo. 4Auto uses slip clutches to function so they will never bind up.  4 hi and 4 low can always bind up an click given the right conditions. I only use 4

txchevy4ever
txchevy4ever

Please post what you find out, and the repair order when they figure it out. Thanks!

Dmcortez
Dmcortez

I recently purchased a 2015 GMC Sierra SLT. I had a 4 inch pro-comp lift and 33's Toyo M/t's installed by a gm authorized shop before I picked up the truck from there dealer. Within 200 miles I notice

Dmcortez Enthusiast

Dmcortez

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I've only driven my one week old Sierra in auto for about 50 miles over the course of 2 days.... In ice/snow conditions. The transfer case had the metal shavings that I referred to earlier .... Wouldn't consider that 24/7 driving and also don't think I've done anything to cause the damage.

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txchevy4ever Enthusiast

txchevy4ever

Posted
Posted

I've only driven my one week old Sierra in auto for about 50 miles over the course of 2 days.... In ice/snow conditions. The transfer case had the metal shavings that I referred to earlier .... Wouldn't consider that 24/7 driving and also don't think I've done anything to cause the damage.

The majority of parts in a car have metal shavings, including the engine. It is more a matter of size, where they're coming from, and if they're due to damage or not.

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txchevy4ever Enthusiast

txchevy4ever

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Posted

The dealership is considering it damage... And they agree that the sound/feeling in Auto is abmormal[sic]... They're waiting for a GM engineer to check out the truck before they decide what to do next

Please post what you find out, and the repair order when they figure it out. Thanks!

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crushNchowda Senior Enthusiast

crushNchowda

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I have no noise with my 4 auto mechanically speaking. (I do have the high pitched electrical squeal discussed in another thread that has to do with the 4 wheel drive knob/circuitry). I have not used 4hi or 4 lo yet. I do remember on my 2007, 4auto was silent but 4hi had a sound as if something new was engaged mechanically (the front drive shaft obviously) but it wasn't a bad noise like a grinding or anything like that, just the noise of something else working. I expect to hear something similar in my 2014 when I use 4hi but so far, 4auto is silent....like I'm driving in 2hi.

tried to find the thread regarding the electrical noise when in 4WD, in fact I believe I posted in it at one point, any resolution regarding that noise?? My dealer says they can't hear it..surrreee.

 

To the OP - I have used the 4WD on my 2014 a BOAT LOAD - 2 heavy duty new england winters and trekking to ski country on a regular basis, the WORST winter by snowfall was this year as well in MA - I can say I have zero mechanical noise and barely any feel in Auto, but do have audible mechanical noises in HI or LO - nothing that seems like damage or abnormal though

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Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

tried to find the thread regarding the electrical noise when in 4WD, in fact I believe I posted in it at one point, any resolution regarding that noise?? My dealer says they can't hear it..surrreee.

 

 

Nope that's how it's supposed to operate apparently. No one here on the forum has it resolved yet as far as I can tell.

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Jon A Senior Enthusiast

Jon A

Posted
Posted

Here we go again Jon.

 

It's not my fault you keep saying stupid stuff.

 

I can prove that driving these things in Auto 24/7 is bad for them.

 

Please do "prove" one of these transfer cases can be ruined by using Auto for 200 miles on snow and ice. The fact you think you can shows you don't know what any of those words mean.

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Isriam Enthusiast

Isriam

Posted
Posted (edited)

No where in this thread did I reply to a post and said do not use Auto 4WD for snow or ice. I replied to the OP and the post on page 1 that said they had audible noise while in Auto. If you drive in Auto 4WD often or for long periods on pavement you WILL wear out your front transfer case.

 

The funny thing is you even quoted me saying driving in Auto 24/7 is bad, and then you replied 200 miles. I never said 200 miles would break it. I said all the time.

Edited by Isriam
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Bill_F Enthusiast

Bill_F

Posted
Posted (edited)

I have a noise in mine as well... redwngr posted this link for me... sounds like my truck for sure, not sure about you:

 

http://sandyblogs.com/techlink/?p=4314

 

What I hear, is a high pitched electrical sound (the same sound I hear when I switch from 2WD to Auto or 4WD). the link sounds like GM acknowledges it, but just says dont replace it, not a repair for the time being.

Edited by Bill_F
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txchevy4ever Enthusiast

txchevy4ever

Posted
Posted

I have a noise in mine as well... redwngr posted this link for me... sounds like my truck for sure, not sure about you:

 

http://sandyblogs.com/techlink/?p=4314

 

What I hear, is a high pitched electrical sound (the same sound I hear when I switch from 2WD to Auto or 4WD). the link sounds like GM acknowledges it, but just says don't replace it, not a repair for the time being.

If it's a problem, then my 2000 and 2006, both of which made the exact same noise, had it, and never had an actual "repair". Never even replaced the transfer case fluid in either.

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Bill_F Enthusiast

Bill_F

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If it's a problem, then my 2000 and 2006, both of which made the exact same noise, had it, and never had an actual "repair". Never even replaced the transfer case fluid in either.

 

Someone on Techlink said to just dynamat the whole TCCM, probably would work, the sound is pretty damn annoying when its there... it just isn't very consistent unfortunately.

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mjj Enthusiast

mjj

Posted
Posted

I've also noticed the mechanical noise on my 2014 when in auto 4wd and 4wd hi. The noise is always present when either are selected. It's not a grinding noise or anything and it doesn't vibrate or feel abnormal just a noise that my 2005 with the auto 4wd system (and over 100k miles) never made a noise like this. I've never noticed a high pitched electrical noise in the 2014. I figured I'd ask the dealer at my first oil change to check it out though.

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Dmcortez Enthusiast

Dmcortez

Posted
Posted

I recently purchased a 2015 GMC Sierra SLT. I had a 4 inch pro-comp lift and 33's Toyo M/t's installed by a gm authorized shop before I picked up the truck from there dealer. Within 200 miles I noticed the same symptoms described here... When in auto mode ( the roads had snow and ice on them) I noiced a growling and a weird feel... Like driving on rumble strips. When I took the truck into the dealership they said when they opened up the transfer case there were metal shavings in there... They said the chain had a lot of play in it so they replaced the chain and bearings ... Put it back together and it's doing the same thing. Now they're starting to lean towards the " it might be the lift causing it" card. Can anybody here confirm if they're having the same symptoms on a stock truck ( no lift)? I would love to call BS on the dealership. The truck is still at the dealership and I just want them to install a new transfer case... Truck has been in the shop longer than its been in my garage. Not happy

 

I recently purchased a 2015 GMC Sierra SLT. I had a 4 inch pro-comp lift and 33's Toyo M/t's installed by a gm authorized shop before I picked up the truck from there dealer. Within 200 miles I noticed the same symptoms described here... When in auto mode ( the roads had snow and ice on them) I noiced a growling and a weird feel... Like driving on rumble strips. When I took the truck into the dealership they said when they opened up the transfer case there were metal shavings in there... They said the chain had a lot of play in it so they replaced the chain and bearings ... Put it back together and it's doing the same thing. Now they're starting to lean towards the " it might be the lift causing it" card. Can anybody here confirm if they're having the same symptoms on a stock truck ( no lift)? I would love to call BS on the dealership. The truck is still at the dealership and I just want them to install a new transfer case... Truck has been in the shop longer than its been in my garage. Not happy

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