So I'm having what I'm hoping is a minor problem with the 4x4 on my ride. I had to use 4x4 the other day while out hunting and now whenever I shut my truck off it re-engages part way. I can hear the hum of the front diff. Then if I slow down to approx 5 mp/h and engage and disengage 4 hi the hum from the front diff goes away. I've had the front left wheel bearing replaced and the right side cv axle replaced. So I'm thinking (and hoping) it's a vacuum leak? Any help would be much appreciated

 

sounds like a vacuum leak.. but where..go to your local auto parts that lends tools. advance or auto zone and barrow a vacuum pump for troubleshooting.. disconnect the bigger of the 2 lines connected to you IWE and connect the pump to the IWE ..pump it up to 15 psi or so and see if it holds.. do both sides...

 

Thanks for the reply techrep