2004 chevrolet 1500 4X4 locked in 4 wheel drive?

I have an 04 chevrolet 4x4 that is locked into 4 wheel drive. I took the front drive shaft out but the transfer case is still turning while i'm driving. I replaced the 4wd selector switch in the dash but didn't help. I was told it POSSIBLY could be the 4wd actuator. I had the transfer case motor off and had it switching back and forth SOMETIMES... not everytime I push the on would it work. I have had 2 guys tell me if its not the selector switch it is problably the actuator. Any help would be greatly appreciated!!!