Question about 1989 GMC K2500

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4x4 wont engage

I have an 89 gmc k2500 series 4x4 the front axle wont engage (help!!!!)

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First thing to make sure of is to check for a blown fuse. The fuse location is marked 4WD and it should be a 25 amp fuse. If the fuse is bad, the lights on the 4wd console wont light up. If the lights do light up, then you can move to the transfer case. On top of the transfer case, toward the rear of the truck is a switch that has a 2 wire connector. That switch sends power to the front axle actuator when you try to enagage 4wd inside the truck. That could be bad. The switch is threaded into the transfer case and is still available through GM. If the switch is ok and the wiring that attaches to it is ok, then you can move up to the axle. Threaded into the front axle is the front axle actuator. These actuators are prone to failure in older trucks and is very prone to cold weather failure. You can test the actuator by removing it and then WITHOUT the truck running, put the truck into 4wd and then turn the key to the hot position. The plunger inside the actuator will extended outwards. More than likely it will be one of those 3 things. If it still wont engage, you may have a short in one of the wiring harnesses associated with the 4wd system. Also, you may have a damaged transfer case. To check the transfer case, put the truck in 4wd without it running and then crawl underneath and see if you can turn the front shaft by hand. If not....it's good. If you can....then the shifter forks inside the case are worn or damaged. I hope this helps.....start small and work your way up!

Posted on Jan 31, 2009

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I would check to see if power is going to the 4 wheel drive aculator. if there is power then your aculator is bad. it is located at the front diff.

Posted on Feb 24, 2009

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