Hey guys, I'm thinking about buying a Olds 12 bolt. Nothing special but I need to replace the seals and bearings (peace of mind). But as I look on Summit at a Richmond repair kit I'm not sure what to look for. I'm going to buy a Richmond 3.55 ring and pinion and also an Eaton posi unit. Do I need to look at the spline count and such? Or am I really just making this more difficult than it should be?