Squeaking noise from diff?

[nfernotalon]

This started happening about a month ago all of a sudden I heard a squeaking noise when I was backing up, it doesnt happen when accelerating just when downshifting at low speeds and only when the car is rolling.

It seems like its coming from the tip of the diff where the driveshaft goes in is there a bearing there? thanks

 

[cruisintalonawd]

yes i think its a roller bearing. maybe check the fluid

 

[nfernotalon]

I did check the fluid and although it was old it was full.