What transmission do I have in my 03 Ford explorer?

Hi! I have a 2003 Ford explorer 4dr 2wd with a 4.0 motor auto trans… I have reason to believe the overdrive has gone out on it and I'm trying to find out what I need here. The door tag say "TR/V" and from what I look up that's the 5r55s. When I look it up just from the year it says I can only have the 5r55w from the year. I'm confused and need to figure out what I have so I can get another one to put in it

2016 Ford Explorer Seatbelt issue?

We have a new computer and new seatbelt for a 2016 Ford Explorer but the light that depicts seat belt deployment is still on. How do we get that light to turn off?

Added (1). We're trying to fix it ourselves. We want to find the solution so that the light will turn off. We installed the new computer and the new seatbelts and airbags but the seatbelt in the passenger seat is giving us an issue. We don't know if there's a current running into system.