[image|1403924]
chk this image above,
this is how usually transmission speed sensor look like.
they can be different too, like the picture shown below
[image|1403926]
and its basically located at the transmission output. as shown in picture down
[image|1403925]
but sometime there are more than one sensors, sometimes two or three, depending upon the manufacturer.
they uses two or three wire connectors, to be sure which one it would be, just unplug and check codes again if no additional codes show, than it's confirmed.