I too had a problem with this smaller steering box and with help from CCP determined that the rag joint extension tube was not drilled out to the correct size. The splined end is supposed to slide past the first set of male splines and onto the second set of splines on the box. This was impossible until someone counter bores the shaft hole to a larger diameter than the bottom of the splines. I also had to shorten the shaft by one quarter inch to make sure nothing would bind. CCP admitted they had made a bad batch of rag joint extensions but no compensation or corrected rag joint was offered.