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Squeak sound when passing gear kicks in 2500HD 6.0l

Bpsuls

By Bpsuls
in 2000-2014 Silverado & Sierra HD

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Bpsuls New Member

Bpsuls

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I have not been able to find any info on this because it is so specific. If I am going down the highway and I floor it to pass someone, when it shifts down it does this odd squeak very briefly, though there are no other noise or performance issues with it. Very strange. Started doing it a while ago. Truck is a 2008 2500HD with the 6L90 tranny and the 6.0L engine. Only has about 100000 kms on it. Curious if anyone has feedback. Sounds like it comes from the transmission but I don't know for sure. No other condition produces this noise, it does not do it while upshifting.

 

Thanks!

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