Rear disk brake conversion, I am having problem finding what manufacturer it is.I believe that it might be either a ford or gm. Could anyone help me id' the manufacturer of the rear end I have. It is a 10 bolt pattern on the diff. Cover and the axle flange measure's from center of the bolts 2 1/2" top to bottom and 2 3/4" from center of the bottom bolts, left to right. Thank you Earl