I have a 78' Bronco with the 4 speed trans. I have replaced the speedo cable and gear for the t-case end of the cable. I can hook up the tail end of the speedo cable to my drill and the speedo works great but when I plug it into the slot on the tail end of the t-case it doesn't work. I have noticed the new gear I installed has a contact mark on the very tip of the gear teeth like it is not making contact correctly with the gear in the T-case. Does the gear inside the t-case go bad like that or do I have something adjusted incorrectly?