99 Expedition awd problem
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Trailering
Joined: Aug 2014
Posts: 16
Likes: 0
From: Chandler, AZ
99 Expedition awd problem
New to site, thank you for having me. Drive system seems to be acting like it's in 4wd constantly and has a whine to it. Have read on the site to pull the #104 fuse under the hood. Did that and still have the jumping problem on the slow turns like it's in 4wd. Any other suggestions? This seems to have started after being in 4low. Have put it in and out of 4wd and backed up all over the place, nothing changes.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
Did you check your vacuum lines running out to the hubs? These line rot and leak over time, not allowing the switching mechanism to work properly. Dirt can also get in there and plug the lines once cracked.
Pretty simple fix if it's the issue.
Pretty simple fix if it's the issue.
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Trailering
Joined: Aug 2014
Posts: 16
Likes: 0
From: Chandler, AZ
Don't think I want to try and go around the problem by disconnecting something. Will try to find the vacuum lines. I'll keep you posted. Thanks.
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Trailering
Joined: Aug 2014
Posts: 16
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From: Chandler, AZ
thanks for your assistance
Fleet Owner
Joined: Apr 2008
Posts: 24,323
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From: 0,0,1
Does the whine seem to be coming from under your feet or from the rear of the truck?
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Trailering
Joined: Aug 2014
Posts: 16
Likes: 0
From: Chandler, AZ
under my feet or towards the front of the truck, wasn't there before the start of the issue
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Fleet Owner
Joined: Apr 2008
Posts: 24,323
Likes: 5,132
From: 0,0,1
In that case I'd say your front clutch in the transfer case is broke. That would explain both the whine and it's inability to disengage. Once you pulled fuse 104 there was no longer any power for the front clutch. This means the problem is mechanical, not electrical.
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SugartasticMSqz
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Feb 25, 2010 10:44 AM