I own an 84 K10 w/250 inline six and four speed manual w/floor shift. Had the truck about a month. Anytime I shift into second gear, either up or down, it is very notchy. Twice, the tranny has gotten stuck in second gear. The pin for second has to be smacked so that the tranny will go back to neutral. My mechanic tells me that the shifter mounted on the side of the tranny is worn out. It uses the fork/pin setup. What is the technical name for this component? What model tranny is this? Anyone know of any online parts dealers where I can find a new one? Thanks.