The pinion gear has 27 splines where the driveshaft mounting yoke slides on. Every factory Toyota 8" pinion gear is that way. Your axle shafts(which slide inside of the locker and your wheels bolt to them) are 30 spline. Again, all Toyota 8" axles ever made are factory 30 spline axles. The pinion spline count has nothing to do with the axle shafts or the locking differential.