Whistle when slowing

I have a 09 dc prerunner trd off road bone stock. When I am coming to a stop there is a loud whistling noise as the truck slows, sounds like a turbo or supercharger almost. Seems to come from transmission, Any ideas?.....

 

Have you checked your brake pads? Might be a stone lodged in one or the caliper might be stuck.

 

It definetly is coming from something in the power/drivetrain, it does it even if I am not on the brakes.

 

anyone have any ideas, seems to be in tune with the rpm's

 

I have the same annoying sound. Dealership took a look and just wrote it off as transmission planetary breaking in. 8k miles later and the sounds still going.

 

I have this exact same problem. As hard as it is to describe a noise, I'll try: it's like listening to low volume helicopter rotor blades whistling through the air- only noticeable during deceleration- definitely tied to driveline rpm. I thought it sounded like it was coming from underneath the centerline of the cab- maybe the front driveshaft u-joint? Extremely annoying. I wanted to search on here to see if anyone had a fix before handing my truck over to the dealership and risk a fubar. Any other ideas or posts that I missed that solve this?
Thanks.

 

I think that's normal that's just your tranny deaccelerating its helps to slow your truck down