why my Camry 2006 model transmission is making metal scarping sound on 50 mile/h

What is your question?

my mechanic has changed transmission fluid yesterday, vehicle has completed 160,000 miles. now it is giving metal scarping sound when crossing over 50 mile per hour I don't know what is the reason beyond that. no leaks

What makes this problem better or worse?

the sound is worse when the car moves in a higher speed

How long has your 2006 Toyota Camry had this problem?

1 day