Question about 1994 GMC Sierra

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I have a 94 gmc sierra 1500 350 engine and the 4x4 will not engage i have replaced the actuator switch but i noticed that when in 4 wheel drive the front drive shaft spins but tires dont lock so i researched and it said to leave the atuator switch hanging to see if it extends and it doesnt.what do i do (maybe bad wiring)

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I have the same truck and mine works

Posted on Jan 09, 2011

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1 Answer

I have a 1994 gmc k1500 4x4 wont go in four wheel change acuator on the front diff transfor case engage but axle dont


That truck did not use a vacuum actuator, it used an electric motor motor. If your transfer case is engaging and you can see the front drive line spinning, then you either have a bad actuator, switch, or the wiring is bad. I would recommend unplugging your actuator and checking for power at the wire while someone puts the truck in four wheel drive. If there is power going to it, then replace your actuator. if not, follow your wiring back and check all components. They also sell an aftermarket cable actuator for those trucks which are much more reliable.

Jan 28, 2015 | 1994 GMC Sierra

1 Answer

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Unplug the front axle actuator. Replace the fuse. Put in four wheel drive. Did the fuse blow? If not replace the front axle actuator.

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1 Answer

My 1994 gmc will not engage in 4x4


replace switch under truck, light may need replaced also, when you put shifter into 4x4 h, place your trans lever into drive, then move forward, 4x4 will engage.

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1 Answer

2000 Gmc sierra sle 1500 on the floor 4x4, 4x4 engages but nothing to the front wheels, the drive shaft spins, but still nothing, any suggestions?


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1 Answer

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3 Answers

4 wheel drive will not engage on my 1989 gmc sierra 2500?


actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

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1 Answer

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you could have problems in the shift control module.or faulty switch in dash.

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1 Answer

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