Transmission?

[Phrogs4Life]

So I can do just about anything that has to do with engines but the one thing I definitely lack knowledge in is transmissions. Recently been trying to replace the transmission temp sensor. Found the sensor but honestly I have no idea what transmission I have and there is like 5 options for filters and pan gaskets. Can anyone tell me how I can figure out what transmission I have exactly?

[jesilvas]

Automatic or manual? 4wd or 2 wd?

[Phrogs4Life]

Its an Auto 4x4 2003 Crew Cab Long Bed

[jesilvas]

A 6.0L I'm assuming?
If so, it's the 4wd 5R110.

[Phrogs4Life]

Seems like every site keeps asking me for a 4R100 so its the 5R110W for sure? Man I hate transmissions and the filters look like nothing I have ever seen

[jesilvas]

If you have a 6.0 it's a 5R110. 03 was the motor and trans transition year.

[Phrogs4Life]

Is there a serial number somewhere I can look up? Also what fluid should I run?

[jesilvas]

What do you mean? What else do you wanna know?
The trans dipstick and manual says what fluid to run.