lift kit installed high 4wd works fine , but 4wd low cant seem to get it in

Have a good 4WD drive shop deal with this. Anytime you install a lift kit, you are changing the geometry of the drive line, this is something that you do not want to guess about, other wise you could have a drive shaft snap when your on the highway and have bad accident. It happens. The fact that the 4wd low is in-op is not a good sign. https://repairpal.com/jeep-repair-in-monroe-new-york