motortusmc

5.3 engine, I'm pretty sure 6l80 trans. It's the loudest in my opinion under the transmission. Kind of hard to pinpoint exactly where it's coming from

My 2016 GMC Sierra is making a weird noise from the transmission. So far seems to be only in Park or neutral. Almost like a buzzing noise. In addition to that it also has a hissing noise when I switch from park to drive or reverse that goes away when I hit the throttle