Hey, I have a 2006 and my 4x4 tries to engage whenever I'm I hit a bump on the roads. I get a grinding in the front end and when I switch it to 4x4 it goes away. The closes place to take it to get it fixed under warrenty is a 2 hour drive on the highway. Is there anything I can do to stop it other than take the front drive shaft off, I'm assuming it's the transfer case or could it be something else causing it.

 

Maybe your vacuum isn't holding?

 

Thanks, I did some searching on the internet and found a few people who had the same problem. Mine is only engaging the driver side. From what I read it's probably the IWE solenoid wich is know to go and I could have water in the vacuum line. I'll have to take a look. thanks again.

 

You might want to go ahead replace that solenoid. If its going bad, it could hurt big time. Mine went bad a couple of months ago and on my way to the hunting camp it start to put my truck in 4x4 while going 70mph. I had no knowledge this was happening and by the time I go to my camp I was hearing this awful noise and I was still in 2wd. What happen is the solenoid went bad and by my front hubs cracked. Now that solenoid will also make a weird noise as well if its going/if it is bad. Shouldn't be more than 50 bucks man...IMO try and replace.