4x4 Low not engaging
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Junior User
Joined: Apr 2003
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From: St. Louis area
4x4 Low not engaging
'88, 5.0L push button 4x4. Auto locking hubs. 4x4 high will engage but once I hit the 4x4 low button, there is a series of clicks followed by a clunk and the 4x4 high is dis-engaged. What is the problem? Auto locking hubs? Or is it the transfer case? I do not know. Any help is appreciated! Thanks.
Posting Guru
Joined: Apr 2004
Posts: 1,399
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From: Corinth, TX
it's not your hubs, those don't have anything to do with the transfer case engaging, just the wheels. Of course manuals are a good way to go... but it's not the issue here. Most likely it's the motor or relay associated with shifting the transfer case. When you say "there is a series of clicks followed by a clunk and the 4x4 high is dis-engaged" do you mean that the light goes off and your t-case is back to 2wd? or does it go to N? Did this work before and now it's starting to act strange, or did you just buy the truck and have never seen it actually work? I have a '93 w/ push-button 4x4 and manual hubs. I know mine will go into 4L only when I'm at a complete stop, but it doesn't matter if the transmission is in D or N or P... it still goes. There is a sensor which keeps you from going into 4L while you're moving and keeps you from switching from 2WD to 4WD unless you're going slower than 55MPH. That may be your problem here, I'm not sure. I know it's not a lot of help but it might get you pointed in the right direction.
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Junior User
Joined: Apr 2003
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From: St. Louis area
Thanks for your input. I am stopped in N and push the 4x4 high...clicks and lights up and engaged. I then pushed the 4x4 low and then a series of clicks and the clunk, then the 4x4 high light goes off and back to 2wd. I just need to know what I can do to fix it myself or is it something that needs to be done by a pro. thanks
Posting Guru
Joined: Apr 2004
Posts: 1,399
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From: Corinth, TX
I'd start tracing wires using a good wiring diagram. If you can find that sensor, you might be able to replace it yourself. If it's the relay, I know that can be replaced easily. It doesn't sound like it's the motor, but ya never know. A wiring diagram is your best friend for problems like this. If you take it to a pro, they're just going to charge you to trace the same wires you can trace by yourself 
. Once you find the sensors, your wiring diagram should tell you what voltages to expect on which leads. Test those with a voltmeter and see if you can find a fault.
That clunk does sound like it could possibly be a mechanical problem, and if that's the case, I'd recommend going to a pro. If it's electrical, I'd say do it yourself.
. Once you find the sensors, your wiring diagram should tell you what voltages to expect on which leads. Test those with a voltmeter and see if you can find a fault.That clunk does sound like it could possibly be a mechanical problem, and if that's the case, I'd recommend going to a pro. If it's electrical, I'd say do it yourself.
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Raymond Bourque
1987 - 1996 F150 & Larger F-Series Trucks
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Dec 8, 2005 08:39 PM
