489 case axle spline count

anyone know what the axle spline count is on a 489 case 83/4 ? and is there more than one axle spline ? thanks

30 or 31 can't remember 31 I'm thinking. All the common cases are the same 741 742 489. Don't know about the early cases

There all the same spline count.

30

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30

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Knew it was one or the other, guess it's a sign of getting older!