i see what you're saying. i don't know enough about the internals to tell you the ansewr. i thought there was no differntial at all, the ATTS replaced it. i don't know. BUT, after reading various other threads, i'm pretty sure the block IS different, and that's why aftermarket adapter plates exist. all i'm saying is, do your research before you buy parts. just trying to do you a favor by giving you a heads-up.