Hi, Im new here but this site has been a great help already. I have a 2001 DR 1500 4x4, with a 5.9L. When I put the transfer case in FWD the front CAD will not engage. I have checked to make sure the transfer case is engaged and it is. I replaced the vacuum switch on the transfer case, still nothing, I checked vacuum on the Vacuum Shift Motor, no vacuum, I went check vacuum on the switch at the transfer case only one port had vacuum. Can any tell me where these vacuum lines are fed from? Can any tell me approx. cost of the 4x4 posi-lok, and how much it would cost to install? Thank-you for any help or info