Re: 2002 4 wheel drive problems
First, do you have the switch on the dash, or the lever on the floor?? If you have the switch on the dash, then the problem is quite common. I have an 03 350 with the dash switch and have had this same problem 4 times. Even though it is an electronic switch, the hubs themselves are vacuum actuated. There are seals on the axles that when they go bad, it causes a vacuum leak, thus there is not enough pressure to lock the hubs into place. It is a real common problem with that model truck. I believe they fixed the problem in 05, not sure though. I have never done the fix myself as I had an extended warranty. I will say that every time the seals went bad, there was a telltale squeak/squeal coming from the front wheel area. Hope this helps.