UUC - Double Shear Selector Rod ( BMW )Double Shear Selector Rod The goal. While producing a "short" shifter, our more important goal in improving the BMW shifter assembly is to increase the precision and smoothness of the overall operation. The problem. One significant wear area that has never been addressed previously is the wear and ovalization of the linkage connection points at the transmission and the shifter's lower pivot. In the original BMW design, the connection at both ends has