Do any of you guys know much about the YJ command-trac system? I have a 93 Wrangler with the command-trac vacuum-actuated front axle engagement system. The vacuum harness was broken, so I replaced it. Now when I shift out of 4wd, the front axle doesn't disengage. I put a vacuum pump on the shift motor and gave it 15hg and it disengaged, and it maintained the vacuum as long as I kept it on there, just like the book says it should, so apparently the shift motor is ok. Maybe I'm not getting enough suck from the transfer case? Anyone have any ideas? This is my first post, but I've been reading this forum for a while and am very impressed with all the knowlege and ingenuity here. Thanks for any help.