Manual Transfer case or electronic?
With the transfer case in 4wd can you turn the front drive shaft?
If you can still turn the front drive shaft with it in 4 wheel the transfer case has a problem.
If the shaft won't turn in 4 wheel but the front axle isn't locked then you have a problem in the front axle interlock. Check the vacuum switch on the transfer case.
You should have vacuum on one line, Vent on another line (Teed in with the transfer case vent) and the last line goes to the axle interlock actuator. The vacuum line starts at a connection at the rear of the engine under the distributor. Then down to the switch. The interlock should pull in when vacuum is applied to it. If the actuator isn't moving you have a vacuum problem.
Friday, December 12th, 2008 AT 11:55 PM