Question about 1994 GMC Sierra

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1994 gmc 4x4 non engaging high range four wheel

My 1994 1500 4x4 will not go into high range four wheel

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  • pjsilva1 Feb 05, 2009

    My four wheel drive suddenly quit working, The floor indicator doesn't light up either. Looks like the linkage is good as far as I can tell.

  • verdugo_673 Feb 20, 2009

    I GOT THE SAME PROBLEM AND I DO HAVE ELECTRICAL MOTOR AND STILL DONT WORK WHAT CAN AI DO OR CHECK

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I would check to see if it is the Axle Actuator.  On that model truck there is an upgrade available that is electrical upgrade.  Instead of using a vacuum to engage the axle, it uses a small electric motor.  The cost for this part isn't much more than the older vacuum model.  Usually the electrical one runs around $100.  This is a relatively easy change that most any person can do with just about any experience.

Posted on Feb 03, 2009

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Ita a fuse i just fixed min i had same problem

Posted on May 17, 2009

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1 Answer

4x4 is not working on my truck.


is the truck working on 4x4 high? you can jack the truck to have the four wheels off the ground and check if the front driveshaft is rotating while the 4x4 low is engaged

Mar 24, 2014 | 1994 GMC Sierra

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.

Feb 15, 2013 | 1994 GMC Sierra

1 Answer

1994 jimmy push button 4x4 wont engage


Could be the servo on the front diff not activating. Could be a power prob or failed unit.

Jan 15, 2013 | 1994 GMC Jimmy

1 Answer

I have never driver a 4 wheel drive. I am going from portland oregon to phoenix az. not sure how or when to switch to four wheel. does the truck need to be in park? etc.


Do you have manual locking hubs on the front? If you do, you have to turn them to 'lock' position. If you have automatic hubs, you skip that step. Never shift into 4x4 low range while moving. You must come to a complete stop to shift in or out of low range. Regular 4x4 (high range) can be engaged while you are moving. Let off the gas, and put it in 4x4 high range, do the same to go back to 2 wheel drive. Vehicles that are part time 4x4 (can be shifted in and out of 4x4) should never be driven in 4x4 while on a dry surface, as you can cause excessive wear or even failure of the system. So only use it in snow, off road, etc. Have a safe trip!

Dec 13, 2009 | 1994 GMC Jimmy

1 Answer

1998 gmc 1500 will not engage front wheels manual


check and adjust if necessary 4x4 shift linkage

Oct 29, 2009 | 1999 GMC Sierra

2 Answers

4x4 wont engage


the motor on the back of the transfer case may be stuck knock on the motor lightly with a hammer when switching the the switch May need a motor

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2 Answers

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try reversing six to eight feet after shifting into 4WD. PLEASE RATE MY ANSWER.

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1 Answer

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Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

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