Suddenly my 4wd seems to engage when it wants. Meaning the front axle is engaging every time I put the transfer case in 4wd. The transfer case is shifting fine and I can tell the front drive shaft is spinning but the front axle only engages once in a while. I engaged it this morning and it went in. Took it out and then it wouldn't go back in. The actuator and metal lines were replaced about 2 years ago, I did notice that the vent fitting on top of the actuator housing is not connected to a vent hose. Could water be getting in and causing the actuator not to operate properly? I think I'm going to start by checking vacuum at the axle and see what it is. It should be about 20 correct? If its not them I guess i'l check intake vacuum. If I remember correctly there is a switch on the transfer case that is vacuum actuated and that engages the front axle?

Thanks for any suggestions

 

17-20.

On mine, it was because the rubber connector at the CAD was a sloppy fit. Couple zip ties to prevent the leakage, and now it works flawlessly.

 

Wow, that had to be hard to find

 

Everything else worked the way it was supposed to, and the numbers were good..... I could tell it didn't fit well... there were zip ties on it when I got it... and that one was gone. I have a supply though.