[Godfather]

I have been sorting things out with the car this week and have 70 miles on it. Last night I opened it up in 4th and took it up to 80mph. Then it happed, both rear wheels locked up and we came to a screeching halt. I thought perhaps I dropped a half shaft but no. I can only shift into 2nd and nuetral positions. In what should be 2nd the car goes nowhere, when I let out the clutch it resist any movement and kills the motor, acts like the brake is on, I discovered what feels like nuetral position is actaully first gear and drove it home that way. I can not shift into any other gears. It is a brand new toploader from David kee. What should I check first?