[travis00]

Its 1 of 4 problems
1 encoder
2 switch
3 tccm
4 wiring
You already changed out 1&2. The tccm (transfer case control module) is behind the pass. side kick panel.Do u ever hear any relays clicking from the tccm? Also check the connector going to the tccm. I've heard of wires pulling out of the connector.
Is the service 4x4 light on?
I'm having problems with my 99 as well. Sometimes i get no lights on the switch sometimes I get all the lights. I was told you can ground pin 13 of the OBD2 connector and get a code, but there is no pin 13 on my connector.
Took mine to autozone to read codes and service 4x4 and ABS codes cann't be read with a hand held scanner. Has to go to dealer to read codes.
Let me know what you find
T