...mine was the second or third change, around 59kish...it's definitely broken in lol

 

the truck has around 130k miles on it, i've only had it since december. im sure it was changed before, there was lots of silver in the oil when i changed it yesterday.

 

got most of it apart today, the diff won't seperate from the case but i noticed the ring gear looks worn, theres a lip on it. this has to the source of the howl/growl. i've never had one of these apart so i don't know if theres a trick to getting the diff out.