Meritor 10spd not going into HI range

Yes. Replaced the sifter knob and the problem went away. Apparently the air gets exhausted through the sifter knob lower part and when some small particles get in there it creates shifting problem. We removed the old knob, (part nr for the new one is under the center plastic clip) and blew some air into the lines, installed new knob and the problem went away. Good luck