Hi @ilikethesims30
As a player who uses a lot of umpa dance mods in my game my first thought was you are going to need a animation mod to make this work
Then I discovered while searching for a chatting inside the car mod it also states in the mod description that you also need the pose player as well and these are both available on the following links
pose player
http://linna.modthesims.info/download.php?t=438706
animation player
http://linna.modthesims.info/download.php?t=441682
both the above will show up in your game as an object which will require placing closeby to your sims you wish the pose/animation you want it to work on.
Last but not least you are going to have to download the creator animation mod (which is placed in your mods folder in my documents) to make all the animations work and come together.
The talking in the car codes that need adding to your animation player (and presumably the pose player but not sure on that) are as follows below which I extracted from the actual car talking mod to make sure it download okay (however there are a lot more than this small list i paste here)
a2o_sedan_drive_driver_x - static
a_car_driver_talk01
a_car_driver_talk02
a_car_driver_talk03
a_car_driver_talk04
a_car_driver_talk05
a_car_driver_talk06
a_car_driver_talk07
a_car_driver_talk08
a_car_driver_talk09
An example of the animation player is in this pic of my teen dance group i play with just with using the animation player object (not the pose player as not required for the dance sequences) and you can see it in front of the group as a small black box in front of the floor lights and this is what you click on and add the codes similar to the ones shown above to make my sims dance the animations i want them to.
https://i.imgur.com/9bfAjvv.jpg
I found a mod creator on youtube for the inside car chatting animation you need but I have not used this myself.. I did download the mod from the mediafire link provided and it does work and provides the mod and the animation codes (a sample shown above) you would need to use in the animation player. (and presumably the pose player)
I also downloaded the pose player from the link above and there were 3 options and I have no real clue which one might be required as I have not used or required a pose player mod before in my game as i only play with the animation player so hopefully another player may drop by and explain that better than me however there is also an instruction link under the video on youtube just make sure when you click on this link to translate the text under the video to English as it is a different language.
https://www.youtube.com/watch?v=FhhhY5FFHi0
I hope you are able to make sense of some of my explanations-)
Good luck :)