4.30 gears w/spool for 391 gears w/sure grip 489 case

I don't have a 30 spline spool. I'm asking of that's what you wanted. Are you going to run the sure-grip? So you have a 4.30 spool set up. 30 or 35 spline?

Yes,I have 489 case w/spool 4.30 gears..need 489 case w/sure grip and 3.91's..oh its 30 spline..