i read about the zexel posi unit for $99 paart P/N: 64501T. i want to get it(i hate my one legger:bash
. i dont know what size rear end i have(7.5" or 7.625"). how do i tell? its a 91 4.3 sonoma. and if i get it will my rear end still be 3.42? how hard/long does it take to install? thanks for the help