31 spline 3.50 posi cenrer section. I bought a complete rear for my skylark and this center section was installed in it. I bought another center section and I'm selling this one to offset the cost. No pictures at this time but I'll be happy to take some if there is an interested party. 600 shipped.. Thanks
I just tested it. The rear is still assembled and out of the car on jack stands. I put a pry bar between the lugs on either side and let one hit the floor. It was all i could do to hold the rear down and get the clutches to slip. So I would say they are tight!