hi everyone i have 1990 xj with the vaccum disconnects on the front axle, and pulling the lever to put it in 4hi does nothing, its really rough and then i can get it into where neutral and 4lo and there is my 4 hi but no neutral or 4lo. i am going to adjust my linkage and see if that helps any. if anyone could help me out that would be great. the fluild level is good, and the linkage is connected. any ideas would be great as im not really sure how the vaccum discos work in the transfer case. thanks alan