98 Vacuum Hub's not engaging

[dper299]

I have a 98 ranger XLT 4x4 w/ 142,000 miles. I recentley had both front hub/bearing assembly's replaced. My problem is that when I shift into 4wheel the transfer case ,drive shaft and cv's engage but the front wheels do not. I jacked up the vehicle and both front wheels spin freely when engaged in 4x4 I took the vacum hubs off and there are no broken parts and they engage/disengage when you push on them. I am holding off using the fix posted on here making them locked full time. So any ideas on where to look.Thanks

 

[triumphrider-1]

Do you want to keep them functioning as auto hubs?

You can modify them so they are selectable (I choose this instead of permantly locking them).

 

[dper299]

To be more specific, I want to eliminate any other causes for this problem before I either use 2 fix options I have seen or just replace the hubs . But I would like to keep it as close to original as possiable

 

[4x4RangerGuy]

Most likely the vacuum lines are leaking or the vacuum solenoid is bad.