well everytime i park my 7 for about an hour or more when i go back i see drops of what seems to be transmission fluid on the ground where the driveshaft is conected to the diferential....i... what should i be looking for here in order to fix this problem?

 

It's either going to be the transmission output seal, or the pinion seal on the diff. Get under there with a light and check the transmission and diff for gear oil. The follow the stream of oil up to where it is leaking from.