95 talon trans problem1 & 2 ok 3rd not

i have a 95 talon non turbo a/t and the car has no problem going in to 1st and second gear but it will not shift itself in to 3rd gear. my father had the same problem with his car and when he got it fixed the trans place said it was a bad switch that only allowed the car use 1st and 2nd so that the trans will not get ruined. is there a switch on the a/t talon is so what is the name of it?


is the kickdown servo or the pressure switch it?

any help would be great