They control the actuator. I would say the front axle has plenty to do w/4LO. I seriously doubt any of the two that need help have a manual shifter
The T-Case motor is back on the transfer case , it has a blue housing - check your connections back there, follow the wires, check all connectors .
Then check you voltage to the motor per manual .
Test the switch voltage as well, in all positions..
A Haynes or Chiltons book will have these procedures, If you have trouble finding them, feel free to ask , me or someone else in the forum may have them handy..
Last edited by jbrew; 07-04-2007 at 08:08 AM.