Originally Posted by nolefanreed15
Do you have an esof (Electronic Shift On the Fly) control on the dash? If so then yes they are automatic. However if you get stuck before you switch to 4x4 on the esof control sometimes you have to manually turn the hubs to lock. They are probably auto otherwise they would show a free/lock position on the hubs as far as I know.
I'm not saying you are wrong, (It may be different on other trucks) if you know you are going to need it then by all means lock the hubs to be sure, but I have never had a problem just using the auto position on the hubs and the turn button on the dash to go into 4 wheel drive. I have seen this issue pop up on the org before, some guys saying the vehicle has to be in motion and the such. My truck (an 05) will engage into 4x4 at a dead stop, no need to have the truck moving, and no need to have the hubs locked. If you have an issue with your vacuum lines then yes your hubs will not lock in auto.