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Front axle actuator on my 1984 Chevrolet 4x4 not engaging front axle

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This is a typical problem in the early 4x4s. First check with a voltmeter set to ohms(continuity). Then unplug the wiring connector at the actuator usually located by the differentials. Connect the ohm meter and measure the resistance. U should have a small reading. If not its the actuator is at fault. If there's a reading, check to see if the cabling and the switch is faulty.

Posted on Oct 12, 2019


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  • Chevrolet Master
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Try moving by hand and or removing and lubing

Posted on Oct 12, 2019


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Posted on Jan 02, 2017


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SOURCE: 4x4 not working when i shift it in 4x4 auto trans

Find the accuator on the front axle it has a two wire pigtail and threads into the axle housing. Check for power and ground if you have both when the transfer case is in 4x4 the replace the accuator. They are available at most parts stores and are a very common problem. Let me know how it goes.

Posted on Dec 16, 2008


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SOURCE: 2001 Trooper: Front axle will not engage when I press dash 4x4 switch

hi guys i would check all the small vacume pipes that conect the sol valves toi the vacume actuators having just replaced the engen in mine i found that these do not have any clips holiding them on tight and can get oil on them and become oversized and leak you can test the diaframes in the actuators by putting a length of pipe on one port and sucking by mouth you can hear the actuator move and then find you can put toung on end of pipe and it will hold a vacume if it does not then chances are the actuator diafram id u/s hope this helps bill

Posted on Jan 09, 2009


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SOURCE: 4/04 ford f150 4x4 front axle actuator won' t stay disengaged

Even though you checked the vacuum lines and found no leaks it does not mean there isn't a problem. The check valve in the line closest to the firewall actuator is probably your problem. Had the same issue replaced this line and solved it. The check valves in the vacuum lines are your best next guess.

Posted on Jun 23, 2009

Chuck Brink

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SOURCE: I changed the actuator, front axle still doesnt spin tires in 4x4

Pull the actuator out plug it in and have some pull it in 4 wheel with the key on and see if it moves. If not then the problem is between the there and the 4x4 switch by the shifter. Check to see if there is power to the wires and then follow them out. Maybe one is broke or even a blowed fuse.

Posted on Dec 08, 2009


  • 334 Answers

SOURCE: I have a 2001 Chevy 2500 4X4. Four wheel drive not

Sounds like the chain in the transfer case has broke or the linkage is out of adjustment

Posted on Dec 08, 2009

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Front axle will not engage, transfer case is working fine. I was told the accuator was probably the problem. There is another sensor right above it and I don't know what it is?

Try this OLD trick.

Next time you go off road, after you made the selector to 4X4 HIGH.

SLOWLY drive backward for 6 to 12 feet.

See does the front axle engage.

Test 4X4 low.

Please give this a shot and let me know the result on the comment window.

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4X4 not working

Okay so I also have an '84 they are the ugly ducklings of the XJ world. and also came with the shi**iest parts. You front axle is a high-pinion Dana 30...toward the passenger side there is a housing that holds an actuator fork (engauges the front axle), most commonly these vac systems go bad, have a leak, or the fork is shot.

I recommend becoming a member (or at least visiting) its all about our cherokees and you can search there for all sorts of diagrams, hints, tips, and advice.


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