I have a 2005 LLY, 4WD, Crew Cab with a 5 speed allison. The gear selector at the column was acting up, not going into park for several seconds, and would not go into 1st or 2nd at all. I changed the NSBU switch thinking it would fix my problems. It fixed the slow park engagement, but it still cannot select 1st or 2nd gear. It is as if the selector at the column is bottomed out at 3rd gear. You can feel the cable getting tight when trying to go to second, but I don't want to force it. I heard that the electrical grounds can go bad and not allow the valves to open/close or something like that? Could this be my issue? Any and all help is greatly appreciated. New to the site but this site has already helped me out a bunch with a few other problems, so thank you!.