Whos spline is it anyway?
 

Moved the 68 today and heard a pretty good bang and knock from the rear end. Jack it up and the rears are locked together like it had a spool in it, so something in the diff let go, anyway was wondering if anybody happens to know what spline it would be. I figure being a car would be 28 but considering its a 429 car, thought might be 31. Its all factory with 3.00 gears, and I just want to get parts gathered up before I pull it apart and find out I dont have the right stuff. Any input would be appericated.