these sensors are external and can be changed easily. they are on the side of the trans. after you secure the new ones, it will be easier to identify the ones you are replacing.
why are you changing them??
The speed sensor is on the transmission ,it has a a two wire connector attached to it, dark blue/black and white/light green wire attached. Disconnect the harness unscrew the sensor and replace. About .5 hour to replace $25 for the part. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is also a company that independent auto repair shops buy their information from that the same information inexpensively to do it yourselfers. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online