2000 Grand Prix GTP only moves when put in reverse

[Grand Prix Ryder]

I have a 2000 GP GTP. I went over a speed bump to fast one day, and parked my car. When I got back into the car the next morning, I tried to put my car into drive and it wouldn't accelerate or move. So I put it into lower gear, 1st to be specific, and the car moved normally. I drove like that for a few days with no problem. Then days later I did the same thing, went over a speed bump to fast and now the vehicle wont move at all unless I put it in reverse. CAN ANYBODY HELP ME?!?!?!?!?!?

[Tech II]

Are you saying, the car only moved in 1st gear manual? It didn't shif into second, third or fourth?

Have you checked the underside of the tranny and pan, for a crack/leak?

Checked the fluid level?

Scanned for codes?

[Grand Prix Ryder]

Yes it only moved in first gear. I can shift into any gear, but the only gear it will move in now is reverse. It was working in 1st gear for awhile, then I went over the speed bump and now nothing but reverse will make the car move. I changed the fluid, havent scanned for codes yet tho.