RCV Big Bell CV Axle Set for Custom - 47 Spline RCV Performance Big Bell 47 Spline axle set is the ultimate solution designed to fit Rockwell or Custom Dana 80 axles. The Big Bell CVs are our 2.5 ton Rockwell CVs, with Rockwell length stub shafts. The iYour shipping charge will need to be calculated based on the weight of package and destination.