ive noticed within the past months my rear is starting to whine pretty loud. i assume its low on oil. If anyone could tell me where the fill checl plug is it'd be greatly appreciated!

 

about half way up on the back side of the diff if I recall correctly it's towards the passenger side but I may be off on that part.

I hope it's just low on oil and not the bearings going out those are a pain to do yourself.