So I pulled my rear end out put hidts 4 link suspension in and I found a 338:1 gear ratio that's a lot better then 411 that i have but can you change your axels to 5 x4.75?.... My next option is ford 9 " we'll I think I found one it rusty diff is sitting in pail of diesel fuel but I can't tell for sure if its one the diff has on the case and " x " with two dots " . " on ither side of the x .....wat does that mean lol and to get axels out we just had 5 bolts on ither side then axel will come out with tires on if that helps and the diff to hold to the housing is 11 bolts