06 f150, 200k miles.

Started a light whine about 5k miles ago, barely noticeable. Changed fluid around 3k ago, noticed no major issues inside, magnet and bottom of case didnt have above average junk.
On my way back from TX, it was noticeably louder, and would make a deeper whine on downshifts (I was pulling a trailer back). Is this thing salvageable, or should I swap out the whole deal for a used unit? I dont have much experience with these things, never took one apart.

Here's a video showing the backlash just shifting from reverse to drive.

https://youtu.be/IiUS00OnwuI