came in the 1976 Lincoln Continental? Was hoping for 31 spline so they could be narrowed. How difficult are calipers/parts to find for the Continental? Have a chance to buy a complete rear end from this car for $100. I have to have it narrowed. Or should I pass and find a 9" out of a Ford Truck? Which years should I look for? Were the posi's in the Ford Trucks rebuildable? Anyone in the Phoenix AZ with one they want to part with?