I heard a bang and then had no power from transmission.

Could this be the drive shaft and not the transmission? A while ago I heard loud noise that was coming from the drive shaft and saw evidence that something had been wrapped around the drive shaft. After a while the noise seemed to go away.

Today, when I got off the highway I heard a bang in the back of the van and then had no power while in drive. I suspect the transmission but I am hoping that possibly it could be something else. It is not worth replacing a transmission so I don't want to waste the money towing it to the garage only to find out that it is too expensive to fix.