2005 4x4 won't engage even with new solenoid.
So my 2005 F150 4x4 doesn't seem to want to engage. Makes for a rude awakening that it's not working when front wheels don't spin and you get stuck on a trail on the property! 4x4 light works when i shift the floor shifter. I read about problems with the solenoid on the firewall so i replaced that to no avail. There is vacuum on the one hose before i plug it into the solenoid. If i just plug the one side of the plug into the solenoid and engage the 4x4 i don't feel vacuum on the open port on the solenoid. I'm thinking if the solenoid opens correctly, i would feel vacuum. I'm not sure if that means anything. i checked fuses and didn't find any blown. Now for the other findings that may or may not be a problem. I am not very knowledgable on the inner workings of how the front differential and hubs work. I lifted the front end off the ground. The transfer case seems to work when put in and out of 4x4: The front shaft locks in and out". The right wheel hub stays locked in no matter what i do. I can't get the passenger side to lock in no matter what i do. When i spin the front drive shaft it will start to spin the short shaft going to the right wheel until it get resistance from the wheel being locked in, then i can just spin the front shaft and nothing spins on side shaft going to the wheels. That worries me but i don't fully understand how the front differential works. Thanks in advance for any insight. I know there is a ton of information out there on this subject and hopefully my problem can be narrowed down.