Question about 2002 Ford F250 Super Duty SuperCab

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4 Wheel drive issues 2002 F250 Superduty

Ok I have an 02 F250 Super Duty and I am having 4 wheel drive problems, am going to list everything that has happened so I can hopefully get help with this.
1. About 3 weeks ago I had to use the 4 wheel drive one morning and it worked fine, just as it always had before that. A couple of hours later I needed it again and it didn't lock in, unnoticed until I was stuck in the mud.
2. I lock in the hubs and turn the switch, I can hear the solenoid/acuator shifting but still have no power to the front wheels.
3. I have heard a slight grinding noise in the front left hub area a couple of times before that but it always quit before I could get pulled over to try to find the source of it.
4. I read that the vacuum pump could cause this and my heater only works on defrost, which kind of points that way but why would I still be able to hear the solenoid if this was my problem?
5. If I just unhook the vacuum and change to better quality lockin hubs how would I change from 4 hi to 4 low? Would the switch on the dash still work that part even though I have unhooked the vacuum to the front hubs?
Please help can provide any more info needed, Thanks

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  • the1stneogod Feb 22, 2009

    I have pretty much the same problem. 02 f250 lariat supercab 4x4 with sift on the fly transfer case. I used the 4x4 2 days ago and it worked perfect. Today me and 2 other trucks went up in the mountains looking for some snow. I get out and lock the hubs, switch to 4hi and we get going. Im the pull out vehicle so i go last. I fallow their tracks and get stuck 20 feet into the snow? I put it into neutral and switch to 4low, I hear it click and try again. Only the rear wheels are getting power. I replaced the fuses to no prevail. My heater works fine in all settings. I tested it going down the mountain by switching to 4 low in 1st gear and the rear end still comes out and i can redline 1st gear. When i got down the mountain i tried switching two wheel to 4hi while doing about 30mph and the truck jerked like it kicked in but i can not test it here. plz help.



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There is a switch on the pass side inner fender that has vac lines on it. this switch was bad on my trk and had the same problems . the switch goes bad because the seals in your front hubs are bad and the vac lines **** dirt and water into the switch .... have the switch checked

Posted on Apr 01, 2009

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If heater vent is affected it is absolulty vacuum problem. There are many places for a vacuum leak, but first. the solenoid shifts the transfer case to 4wd then the switch it trips tells the GEM module, which tells the vacuum switch on the firewall. after it switches it supplys vacuum the to the front hubs which lock them. If you get out and lock them manually then 4wd will work unless you have a faulty switch or transfer case. The common vacuum leaks are switch on rh fender near pump, then hoses they tee off on lower rh side the head left. The most common and most expensive ar e the vacuum seaks inside the spindles, WHich takes Good tools and know how to replace.

Posted on Feb 10, 2009


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SOURCE: how to replace doorlock acuators on 2000 F250 Super Duty

you got to take a drill and drill the ribits out and replace them with bolts and nuts its a little tricky to get it out so watch for the glass and wires i hope this will help you

Posted on Jan 26, 2009

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