Tedy, I'd try cleaning out and replacing the shifter gear box grease, if you haven't already. I've had no problem with it this winter since I replaced it before it got cold, but Yelostn78 (I think) took his truck with the three speed out on the road for a little while and couldn't get it to shift at all, and come to find out, the grease in the box was so old that it had froze solid.
