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Old 12-23-2013, 05:25 AM
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4WD problem

Hi all, I've spent some time searching but haven't foound my answers. I have a 2003 F350 7.3. Auto, sotf, and warn manual hubs. My 4wd is not working in high or low. The 4x4 and 4x4 low indicator lights work correctly but the truck is clearly not putting power to the front wheels. Yes, the hubs are locked when I'm trying this. My front drive shaft rotates whenever the truck moves. Hubs locked or free, 2wd or 4wd. Any thoughts before I take it in?

Thanks.
Dan
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Old 12-23-2013, 05:59 AM
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Lock the hubs, put it in 4WD, move the truck back & forth some, shut it off and jack-up each side (one at a time) and grab the tire. Make sure they can't turn to Know both hubs are locking correctly.
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Old 12-23-2013, 06:07 AM
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should the front drive shaft rotate wit the truck in 2wd and the hubs free?
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Old 12-23-2013, 06:23 AM
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It can actually, AND if only one side is UnLocked it will be turning but because of the open diff, you won't have 4WD...
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Old 12-23-2013, 08:25 AM
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ok, in 4x4 hubs locked. moved it forward and back a few times and jacked each side up. both sides will spin. the drivers side seems to have some engagement with the front drive shaft, the passenger seems to be totally free. I assume this means hubs? their about 15 months and 7000 miles old.
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Old 12-23-2013, 10:09 AM
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Yea, sounds like it, you shouldn't be able to move a locked wheel with the other side on the ground and the TC in 4WD. That's what you have - right?

If so, take the hubs off, take them apart, clean 'em up and regrease. They should work fine after that if you find nothings broken inside...
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Old 12-31-2013, 08:35 AM
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can u hear the tc motor clunk when going from 2wd to 4wd. with tc locked in and hubs unlocked you shouldn't be able to turn front drive shaft. I had this problem and it was a corroded wire at the tc relays. they are up by master cylinder if I remember it was a brown with blue stripe. but don't quote me. the relays have a 5volt trigger wire that comes from gem module. and has 12v from battery. one relay turns tc motor clockwise and one makes tc motor go counterclockwise.
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Old 01-03-2014, 02:52 AM
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Broken warn hub. Only a year old so my local shop warranted it. Thanks for all the help!
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