I have a 2012 LGT with 130k miles. Been noticing a similar vibration/rattle sound around 2500-3000 RPM but only when the car is decelerating. It’s last as long as it’s in that RPM range. What was the end verdict of this repair, and rough cost? I need to do my belt and pullys soon anyway and I’d like to fix this too if it’s the same thing.. thanks!