i need to put a posi in my car,and im thinkin about using the Powertrax unit. It goes in place of the "spider" gears on the rear end and u dont have to do run measurements and such as u would if u would put in an Eaton or Auburn etc. posi in.

Has anyone here used them,is using them,or know some1 who is? how well do they work? are they strong?

thanks for any replys