help cascadia 126 have Noise when accelerating

My 2019 cascadia 126 dd15 have Noise when accelerating，There was noise when I was driving at a speed of over 35 mph, and the noise became louder when accelerating. The truck drove normally, there was no engine light, I thought it was the turbo at first, but there's nothing wrong with the turbo and The mechanic checked and said it might be a problem with the transmission . I need to pay a $1,000 fee to check but I don't think it's the transmission . Does anyone know what the cause is? Thank! There is a video below for reference. https://youtube.com/shorts/q4HNiQ_634A?feature=shared

 

Thank you,t

The oil is good and was changed a few months ago. I just checked the driveshaft and it looks like there is a problem where the transmission and the yoke are connected. I do have to check the transmission . Thank you very much for your help. I uploaded another video: