Originally Posted by hargrove
My friend has a 2000 F150 won't go in 4X4,I swapped the vacum lines around on the actuator and it locked in. Is it ok to run it like that till we get a chance to figure what the problem is
No, put it back into 2wd. If it's locked in 4x4 mode on dry pavement, you'll be buying a ton of new parts for the front end.