I replaced a defective vac actuator. now I am able to get my auto 4wd to work and sometimes 4Lo, but have a hard time getting in back into 2wd, and can't put transfer case into neutral when I push the 2wd and 4lo, (like I'm supposed to be able to do). Its a 99 s10 blazer. I was thinking it might be the indash switch, or perhaps the engaging motor,.......bough a 98 jimmy but it doesn't have the 4 button switch. would replacing the wiring with the switch be possible or perhaps even the engaging motor swaped out for the Jimmy's? Can I do that?