Here is what I recently did on my 74 t/a 8.5" 10 bolt. My stock axles were junk.outer bearings had cut into the bearing surface (before I bought the car). I bought new 12 bolt 30 sline axles for the same price as the 10 bolt 28 spline axles would have been,new outer bearings and a new 30 spline 8.5" posi w/400 lb springs and composite clutches. I also regeared the car at the same time but if your gears are good and the ratio you want it isn't neccesary. The axles were only about 200$ and did not have the weak looking factory taper either,seriously beefy compared to stock 28 splines although I have seen very few 8.5" rear ends actually break axle shafts,Smitty
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