what is that black mount looking thing on the diff housing? my stock M2F4 doesnt have it but has the hole drilled for it, what is it used for? and do i need to put it on? cuz if my stock one doesnt have it then why should i use it?

 

If i'm thinking of the same thing that you are, it is just a lifting spot. If you can take a pic. That will help us help you.

later
ken