Happend early this morning around 1 am. I was pulling out of a gas station after filling up and then I hear a very loud clunk and my car stopped moving and started to scream!!!

I pulled over and put it in Neutral and the Noise stopped. Then I put it back in drive and the loud clunking started again. In Reverse it wasnt that bad but still there. I have a Extended Warranty so the car will be towed to the dealer first thing in the morning. Looks like Im stuck with no goat for about a couple weeks!
I also want to mention that I had just replaced the tranny fluid two days ago. I used Dexron VI even after doulble and triple checking that it would be ok to run it in my trans. I know that from the factory it comes with Dexron III.