ok i got a question. i don't know much about differentials, but my car came with the torsion sensing diff. well the guy i got it from said when he put the 4.11s in it, he had a problem with it clearing a key way or something? he trashed those and put the 3.42s back in.

now my question is, will i have any clearance problems with 3.90s in this diff? sorry but i really don't know what key way he is talking about. all i know is he said slp sells a two piece replacement or something that i might need? i was talking to him about putting in 3.90s and he told me that they may not clear that key way, so i figured i would ask and see if anyone has any experience with this rear end? thanks
mike

again sorry for the lack of info, but not a diff guru.

 

probably this,
http://www.slponline.com/view_product.asp?P=64002