I need to get this fixed today to be able to make a trip I'm supposed to be leaving for friday morning. I have an 86 turbo truck with an R151/doubler with a broken 23spline input gear on the rear case. I need help figuring out my immediate options. I have a friend with a doubler setup he's not using behind a w56 or something. Could I swap part of or the whole doubler over to my 151? Anyone have a 23spl input gear laying around????