Noise from front running gear!

[quicker]

2009 Expy Max Limited 4WD

Question 1: when things are working properly and the truck is in 2WD and I jacked up the front and spin a wheel should the axle spin at all or in the intention of the hub actuator to completely release the axle from spinning at all? If so is it normal that both actuators go at once?

Currently both wheels spin the axles when in 2WD.



Question 2: As I roll ahead from a stop I get a clunking noise a few seconds after I start rolling. Quite loud, but like clock work every single time I start rolling. Only happens while rolling at 15 MPH and as soon as speed increases it stops. I think even if I maintain that speed it stops. Any ideas?



Any thoughts on on either would be greatly appreciated.

Thanks

 

[JExpedition07]

For question #1 if the truck is running in 2WD the actuators should not be engaged. The wheel should spin freely of the shaft. If the truck is off the vacuum isn’t present so they will be locked in. The vacuum system can be kind of a pain, I’ve basically replaced the whole system minus lines. (Solonoid, Check valve assy, Actuators).

 

[quicker]

ah thats the part I was missing. truck is off so they are locked due to no vacuum.

I'll test again with truck running.

Still no idea what that noise is when rolling ahead