Transmission chirp when shifting from 4th to 3rd

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Good morning I hope y’all have a great Christmas. I have a question I just had a 6l80 put in my 2015 GMC Sierra 1500 5.3 4x4. Every once and awhile when I’m going around 40 MPH and I tip into the gas and it has to shift from 4th to 3rd it will make a chirp sound. It doesn’t do it when I am braking and it shifts from 4th to 3rd only when getting on the gas. Not every time but maybe 50 percent of the time. It shifts great is this something I should worry about?

DanielBrazzle in Appling GA

Dec 24, 2020

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Transmission chirp when shifting from 4th to 3rd

What is your question?

DanielBrazzle in Appling GA

Dec 24, 2020

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DaveJMon Dec 25, 2020

Happy Christmas -- I'm pretty sure this is a "normal" sound of an accumulator inside the transmission upon load. Abnormally normal, that is. But likely nothing to be concerned about. Did you acquire this transmission remanufactured? Used? Any warranty to consult your repair facility about? Never hurts to check into it.

DanielBrazzleon Dec 25, 2020

It’s a remanned unit it has a 3 year 100,000 mile warranty

DaveJMon Dec 27, 2020

I, again, would seek the opinion of the installing technician / shop as they should honor the warranty as provided.

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Popular Answer

What are the best GMC repair shops?

RepairPal Certified shops can diagnose and repair your 2015 GMC Sierra 1500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.