Mopar 8.75 posi. wont work. Why are there 2 rows of spline?

73 Plymouth Duster said

fired an email off to him and I can't wait for a response, I sure hope I have the rebuildable type. i really dont want to get a new housing or axles.

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I have rebuilt several clutch type sure grips and absolutely guarantee the pics you posted are of a clutch type sure grip. Like the others said the cone type has springs visible through it's 2 openings. Unlike a clutch type which has several openings and no springs.

BTW: Notice I called it a SURE GRIP, not a posi... That's cause it's not a Chevy rearend.:D