Clunking/ knocking noise when floor my 06 Yukon denali

[Brad poiencot]

when I floor my DENALI it has a clunking noise . Sounds like something spinning. Only at full throttle though. If I drive normal it doesn’t make any noise. Even when turning and over bumps it’s quiet. Anybody ever experienced this??

 

[Brad poiencot]

Well if anyone else experiences this sound under hard acceleration it is the transfer case chain. Mine stretched. Installed new one and everything works great.

 

[retiredsparky]

I agree about the transfer case chain. If you think about the logic, a chain has many different parts that can wear and stretch. I have replaced multiple chains over the years in different vehicles that had clunking in the drivetrain. Almost always solved the problem. It seems to be more prevalent in vehicles that are driven in town from constant starting and stopping or from offroading or towing. Highway driven vehicles seem to have less of a problem with the chains.

 

[redline165]

I’m having this exact problem but I can hear what sounds like a chain slipping over teeth. Where do you get the replacement chain and a rebuild kit with the sensors

 

[Fless]

I’m having this exact problem but I can hear what sounds like a chain slipping over teeth. Where do you get the replacement chain and a rebuild kit with the sensors

Pretty old thread to be digging up, but maybe @rockola1971 or someone else has a good source to recommend.

 

[rockola1971]

I’m having this exact problem but I can hear what sounds like a chain slipping over teeth. Where do you get the replacement chain and a rebuild kit with the sensors

Chain stretch is very common on a high mileage transfer case. If not caught fast enough it results in the chain chewing up the inside of the case and come peaking out of a YUGE hole that it has made which destroys the case.

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