46re dakota ram

I have a 2000 Dodge Dakota with a 5.9 and 46re trany. I just got the truck, engine wasn't running.. got engine running went to drive it noticed only forward response from transmission. Checked fluid levels found low and slightly discolored. Dropped pan found small amount of metal but no snap...

So i was driving about 30, passed the house i was going to and possibly shifted to fast down to reverse. I reversed fine, drove the car in reverse into driveway then moved car around the corner of street also. Then when i went to leave the car wouldnt go over 15 mph. Once it tried to shift...