My lights come on to say its in 4 wheel high and or low but guns won't lock. I checked the diaphragm hose and its not sucking. I checked for any missing hose cracked or unplugged and can't find any. I followed the hose all the way to the transfer case and unplugged the three hoses and no air is being sucked or blown through the hoses or the transfer case. Any suggestions?

 

the thing on top of the transfer case where them three hoses hook into could be bad but your vacum comes from the back of your intake .

 

1. To ensure 4x4 works, take vicp grips to the wire side of the actuator and see if 4x4 works then.

2. If it works. I need to know the engine and transmission you got for the diagram. It should "t" with your hvac line or accessory line on the carb or w/e you got.

Heres the link for the vacuum diagram, but they don't show 4x4. You can follow the link in my tsignature, but by your original post I'd swear you've seen it.