1980 Malibu with 350 motor and 350 trans.Not sure what year the trans. is,it is not original to the car.So I,m driving to work today and I go to pull off from a stop sign and the car will not shift from first gear.It does not slip and the fluid is full.It will still shift perfectly if I manually start off in first gear and go through the gears with the shifter but will not go from a dead stop and shift from first automatically.Never had any issues before this and was sudden.I would appreciate any help or suggestions,thank you.