3rd gen tacoma squeeze when shifting into reverse

Hey guys when my truck is stationary, I get a squeak only when shifting into reverse. I also just changed the transmission fluid. I added about a quart more and let it drain to a Trickle. I used the temp check mode on the truck to indicate when it's safe to do it. And I used a scan gauge. The was 96 degrees when I checked it. Any idea what is causing the sqeauk in reverse?

 

If it’s more of a creak, my guess is lack of lube on the leaf springs. You have to give much more information if you want more grab a wild guess.