transmition 4t80e problem
 

HELLO I have Cadillac Seville STS made 1994 vith 4.6liter nordhstar engine with 4t80e transmition and to me the error occurred on transmition.vhen driving the car 100-120 km/h transmission shifted into neutral and then into second gear and stays there no matter which position i put the lever and I have only second and reverse gear and turn on lights dashbord check engine soon.If Can anyone help me what is wrong with transakel.Before I had no problems and the car has only 120,000 kilometers.THENKS