How many splines are my rear axles

[ohfugit]

I've got a 93 sport with a 8.8 housing 327 open rear end with the ABS Ring.

I was considering replacing it with a posi chunk
I see 28 spline ones and 31 splines ..
anyone know which I have ???

Thanks
"D"

 

[Alec]

31

 

[ohfugit]

Thanks Alec.