RE: 2 speed problems
There is a pretty good thread over on LSTCentral about the two-speed, and there is a pretty good chance that you are shifting, but you aren't hearing it because it is happening too soon. You said you've adjusted it so this is a good possibility.
Put your LST on blocks and start it up. Give it some throttle (slowly) and watch for the shift point. If it is happening early on you won't hear the engine whine out and change so much as you will see your truck sort of "wobble" when the shift occurs.