Review on Enhance Your Vehicle's Performance with the Dorman 600-105 4WD Actuator for Ford / Lincoln Models by Robert Ogrodnik

Winter is never the right time to find out that your 4WD isn't working, but of course it always is. Luckily it wasn't a difficult job if you had a good tool set. The only "special tool" you'll need besides a good set of sockets and wrenches is a torque wrench. There are a few nuts that need to be tightened to spec and you don't want the bolt to be too loose. There are some great videos on YouTube that walk you through the whole process. I highly recommend Ford Tech Makuloco's video, he does a great job and explains every step of the job. To check your hubs, do the following: Raise the front of the truck. Turn each front wheel manually with the ignition off. The hubs are locked by default so you can see the wheel turning around the axle shaft when the hub is properly locked. Next, start the truck and leave it on 2wd. You should be able to turn each wheel freely and the axle shaft should not turn on either side. (In my case, the passenger side didn't lock and the driver's side didn't unlock. Find out.) If both wheels lock and unlock properly, the problem may be in the transfer case or elsewhere. Probably just a few hours at this job and my 4WD will be running like a champ again. The process is pretty easy, I was only able to do the second stroke from memory after watching the video and doing the first one.