i bought this 86 gn from up north and ship it to atlanta ga the guy told me the motor and transmission was rebuild when i got the car he had all the paper work on the car. when i start the car up then i put it in gear and it didn't go nowhere then i cut the car off less then 20 second and check the trans. fluid and there eas no fluid then i added about 5 qt into the trans. and it still didn't move what can the problem be thank you