hello all, this is my first thread. I am having issues with my 4x4 engaging. Back story I replaced the iwe's front axles, vacuum selenoid and the typical upper lower ball joints and tie rod ends. everything looks like its working 2wd working great iwe;s maintain vacuum. I can get the 4x4 to engage only if i disconnect the vacuum lines from the selenoid to the iwe's then i have 4x4 on dirt its fine on hard surface it binds up and locks up I am thing my front tires are more worn than the back to cause this, anyway. in 2wd there is vacuum from the selenoid, in 4x4 it does cut the vacuum. The only thing I can think of is maybe the iwe's vent lines are clogged? any suggestions? thanks alot!!