The fact that the axles are in an A body rear may be the problem if you ordered the 35 spline axles for an A body housing. I thought the bell drum design and backing plates used on the 8 3/4 A body housings (4" bolt pattern)was an oddball all to itself. I would call or p/m Doctor Diff. If anyone can hook you up or at least let you know whats wrong it will be Cass.