27-7/16" axles on 87 buick regal

[lt187regal]

Ive got an 87 regal (Nat-asp) that I'm dropping an lt1 into.

I have purchased an eaton posi that needs 28 spline axles. Moser engineering said that my axles are 28-7/16" and does not know the axle spline. Does anyone know what spline my axle spline are.

 

[gn1220]

Post this in the tech section. You should get an answer asap.