Hi. I been working on my truck for a while is not a show truck but is going to be my weekend worior, so I'm down to the rear part and I got this posi center unit and ring and pinion of a 87 grand national, because I say they both 8.5 10 bolts and my truck axels are 28 spline so will fit, now few people told me won't fit, if some one out there can give me some info on this please let me know thanks Pete