Hi I have a 1996 dodge 2500 4wd truck and live in central Pa . On friday 12/28/2012 it snowed and I plowed with it in 4wd .when i parked it I placed back in 2wd .The next day it snowed and when I went out to plow again and putting it in 4wd it would not ingauge so I taped the actuator by the right wheel and it started to make a grrrrrrr sound and finly locked in . but all day it would pop in and out of 4wd. Is the trouble the actuator and if so how much of it needs replaced I see there are several parts thanks for any help