i searched around for people having a similar problem but found nothing,

my problem is with the car in neutral it still creeps forward like its in gear i have 1 2 no 3 or 4 and i got 5 and R i just put in the transmission and it was rebuilt i dont know if its an internal trans problem or if the shift arm lever where the linkage hooks up is put in worng and its not engaging the shift rods in the trans anyone had this problem or got any suggestions? i only need it to work long enough to get it to the dealer i decided to trade it in on a fit