Only 2# XXXXX Vacuum... not very good.
This is what I did:
elevated all four wheels of truck off the ground with jack stands, engaged 4wd and checked the vacuum. placed vacuum line back on front axle servo and re-engaged 4LO, transfer case shifted to 4LO, put it in gear, front axle not engaged. placed back in Neutral with truck still running went to front axle servo and manually pulled cable to engage front axle, shifted back into gear and front axle was engaged truck was in 4wd LO. placed back in neutral, shifted to 4HI, lights flashed but went to 2HI, placed in gear and front axle was still engaged and transfer case was in 4HI, after running in gear for a little bit it popped itself out of 4HI. Tried placing in 4HI, 4HI and 4LO lights flashed and went back to 2HI.
before all of this, on my way to the parts store i was cruising at about 45mph and wanted to check the 4HI, I hit the 4HI button and the 4HI and 4LO lights flashed, stayed lit but everything was disengaged I couldn't go. I tried going back to 2HI but nothing happened, I had to bring the truck to a stop, put it in Neutral, place it in 2HI, then put it back in gear.
this is starting to be a real pain and think it's going to cause me to shell out some major cash to fix.
I greatly appreciate your advice thus far,