The whining noise while backing up on my 2015 Ram 1500 has been happening for several years since it turned a little over 30K miles, and it's been getting worse ever since. At some point I suspect the rear end will fail. It's a little heartening that others are having this same issue, but it stinks that Chrysler won't take ownership of it and recall the myriad of trucks that need to be fixed!

Come to a complete stop, put transmission into R, back up into driveway (or wherever) and the whining noise begins, gets louder as speed increases in reverse. Sounds like a faint siren, possibly coming from rear differential?

Don't notice any unusual sounds when in forward gears, only when reversing. The rear axle recall was completed when I first purchased the truck in Oct. 2015, this "siren" issue began a few months ago, wondering if it's happening with other owners.