I started getting a whine in reverse a few months ago. So I had the tranny fluid replaced. Now every once in a while I get a loud clunking sound from the rear of the car when I reverse. It sounds like something is caught or dragging. I did a search on Google and found that others have had this problem with no reason why. Anybody else ever get this or know why its happening?

Um first off is it an auto or maual... second your car is FWD this means their are no mechanincal drive componats past the front of your drivers door.. however there is an exhaust system that can hit/rub on things, sometimes with fwd if a exhaust hanger comes off it can bang or rub on the car when the drive train "torques up"
that would be where i would start... check your exhaust

i had a clunk/clang when changing from reverse to forward... shortly later my tranny went out.... thank god it was still under warranty