i have recently noticed a whining sound

What is your question?

upon acceleration and as the car slows without breaking. im taking it for transmission fluid change, but its been only 2500 miles since I did that last I also hear a metal sound when taking off from a stop. last time it was just a loose clamp and that fixed the problem. I have removed the heat shields toward the front of the car, but have never checked to see if there are any near the tailpipe.

What makes this problem better or worse?

nothing

How long has your 2007 Toyota FJ Cruiser had this problem?

a year on the rattling 2 mos on the whining