Can anyone help????

[Jessica 24]

I have a 2002 cavalier that has a bad speed sensor. I know that the car has two sensors and they are located somewhere on the transmission. I have found one of them and replaced it but that didn't help. The mechanic I talked to said that the other sensor needed replaced and he could not find where this sensor was located. Does anyone know where the location of the two speed sensors are? If you could help it would be greatly appreciated.