Due to the nature of U-joints, when using two on a shaft it is necessary to Mis-Phase the U-joints, this is the proper way to create the shaft. Mis-phasing is accomplished by making sure that the yokes attached to either end of a shaft are 90 degrees out of alignment as opposed to having the yokes aligned
– or in phase. Placing the U-joints In-phase is a common misperception. Steering Coupler with 9/16"-26 on one half, and 3/4" smooth on the other.