please please i need all help i can get, drive train mopar chrysler 8.25 27 spline 10 bolt gears

Do we know that it is really an 8.25????

I know the PN says so. But... We're there diferent versions of 8.25 like the 741, 742, 489 8 3/4?
i dont know i ran number say 69 to 70 b cars and 8.25 27 spline and i measured the ring gear and measures 8.2