Transfer case select switch??

[Bulldog400]

Every time I start my H2 all the lights come on the select switch but the top round button blinks for 15 to 20 sec after all other lights go out the others light up and go out and the top square button stays on. I do have the service 4WD message on but it will shift into 4hi and 4low with no problems but in 4low and in N the top round locker button(after pushing it) will only blink for 20 sec and go out. I'm hoping that I only have a bad switch. The rig has always had a binding feel when you turn the wheels sharp eather way and in forward or reverse. Last week during the snow it started alittle poping sound on the pass. side front. Not sure what it is but at high way speed you dont hear anything but around 5 to 10 mph it makes a clank,clank,clank sound. I also noticed the binding feeling seems to be gone but I dont think the front wheels are pulling only the rear. It seems like i have more than one problem here. Can someone give me some ideas on whats going on with my rig. Thanks, Rob