take the pan off the trans and you will find a pile of chips/metalic sludge below the 1-2 planetary----in a few days you will be leaving a traffic lite and the noise will be worst(louder) but the car will continue---til the next stop, then it won't move at all

For proof----you can do a couple of things--lock the trans in 1st and accel then decel---will be quiet----lock in second----might not move at all but if it does, it will be quiet

But---you are cruuising around looking for a ride on a flatbed---parts to fix it about $80 plus oil and gaskets