so today i finally got a chance to take a gander under the car just to check things out so i took some pics just to confirm some things im unsure of...
this is the drain plug for the tranny right?

and this is the fill plug?

and this is the tranny mount?


next was the nav system,
this was underneath the bracket and what is it for?

then finally once i got behind there i found this random plug with a dust cap wrapped in foam.. what is it for?

 

and one last thing i was able to find the drain plug under the rear diff as well, but i dont know where the drain plug is, could someone help me out with a pic or something? i really appreciate the help. i dont have an owners manual or a repair manual yet either so im shootin in the dark. thanks!

 

Pics & DIY inside.

Transmission

http://www.audiworld.com/tech/misc32.shtml

Rear Diff

http://www.audiworld.com/tech/misc33.shtml


Wheres the NAV, your trunk? I dont have one of those...

 

thanks for those DIY's i think my drain plug for the tranny is different tho but no big deal its the same process. the nav system in my car was on the driver side underneath where the spare tool box goes. heres a picture of it with the carpet pulled back and the tool box removed...