Question about 1994 Chevrolet K1500

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We have replaced the four wheel drive actuator and it still won't lock into 4 high. any suggestions?

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Hest wire to see if it has power when activated

Posted on Jan 31, 2010

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1 Answer

2007 Dodge Ram 1500 hemi my 4 wheel drive does not engage after turning the switch to 4 wheel high or low I hear clicking under vehicle but does not engage


Remove the actuator motor assembly from the transfer case and try to manually engage the transfer case, if it is easy to engage then the actuator is the problem.

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When I put my truck in four wheel high or low and lock the hubs in it dose not turn the front wheels and is not in four wheel drive


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I have a 2004 2500 HD My 4 wheel drive suddenly quit working I put in a new actuator My 4 wheel drive indicator light show I'm in 4 high or 4 low you can hear my transfer case shift but it still won't go...


May be the problem is not in the actuator in the case but in the actuator that engages the hub locks . Check for vacuum line / electrical wires faults . The noise may be from the hub lock or from a cv joint in that side.

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My 04 Tahoe will engage in 4-high or 4-low, you can hear the clunk and in 4-low it is in low gear but it will not engage the front axial, but in 4-auto it will work fine. All lights indicate everything is...


I had a 4 wheel drive suburban..it had issues with the high-lock and low-lock..I just used the auto setting because all four wheels were getting power anyway..only time you need lock is when you plan to go bogging in really deep mud..on snow/ice all you need is all wheel drive..you actually have better control..as long as it works in all wheel you should be fine..also be checking the front hubs.. are yours full time or do you have lock outs..on the axle hubs..thats my question

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maby im wrong but if you rev up and only rear wheels spin that means that it might be 4 wheel drive but not constant 4 wheel drive or diff lock system ,,,, ,, in 4 wheel drive all wheells will turn together but if pressure of slip is bad enough or torque high enough only 2 wheels will drive ,,, thats why diff lock locks wheels together in each axle to over come this ,,, all wheel drive like in landrover locks all 4 wheels together to ensure all wheels rotate to give best grip

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Can the four wheel drive actuator freeze up and cause the four wheel drive to not engage ?


yes. sometimes not servicing the differential can cause the actuator to stick in position. either you can or cant put it in 4 wheel. you may have to replace the actuator and service the differential to cure this. hope this helps

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Have you checked the switch on the transfer case? Those switches tend to go bad and primarily operated the 4 wheel Hi.

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95 blazer 4x4 4 wheel drive not working


There is a vacuum actuator mounted on the front differential that locks the shafts to engage four wheel drive.

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2001 Chevy Blazer 4 wheel drive


The four wheel drive systems in these vehicles are simple. The push button controls the four wheel drive computer. The computer tells the encoder motor (on transfer case) to shift. When the transfer case shifts there is a vaccum switch on the transfer that is activated which sends vaccum to the accuator under the battery. The accuator pulls a cable to lock the front axle in. This covers all s series trucks and suv's with push button four wheel drive but not with auto or all wheel. Now to answer some questions. If your push button is lit up but will not go in to four high you should try to reset the four wheel drive computer. To reset pull the courtesy light and atc fuses for sixty seconds install fuses then cycle key on and off 5 times. If your transfer case shifts but your front end does not lock in check for vaccum at the switch on the transfer case in and out. If no vaccum out replace switch motormite number 49315 at parts store. If you have vaccum out check accuator.

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