Question about 1991 GMC Sierra

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I have a 1991 GMC Serria 4x4 it used to shift slowly int 4 wheel drive now it wont go in at all It just stays in 2 wheel drive I have tried backing up moving forward. It will shift into nutural.

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  • Anonymous Dec 31, 2008

    I have a 1991 gmc z71 4x4 and the 4x4 is not engaging

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  • 62 Answers

More than likely the actuator has gone bad or just the switch

Posted on Dec 20, 2008

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1 Answer

2005 Sierra 4x4 doesn't work, 4h light is on and stays on


My 2005 Sierra 4x4 did the same thing while running down the interstate on vacation. Scared me to death, thought it was going to shift into 4 wheel drive @ 80 MPR. Had to take to shop and they found a censor bad and they replaced it. Don't know cost, because truck was still under warranty.

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I got a few questions i got a 1992 gmc serria sle model with a 5.7 th700r4 tranny and is 4 wheel drive the first question i have is if u go to put in in reverse with it in 4lo and turn the steering wheel...


Trnasmission going out, Did you know that reverse is the same as second gear. Does it slip in second gear are should I say have a hard upshift like around 20mph. Got a friend have them drive it in reverse and see how fast the drive shaft is turning also do you hear a whinning noise.
























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Have a gmc 2005 sierra the 4x4 doesn't work. when I press the 4x4 button blinks a few times,and then makes like grinding sounds,it sounds that is coming from transfer case,but never engage and ligth goes...


Not good! there is a sensor in your transfer case that senses that you are now in four wheel drive if your transfer case does not lock in it will set a code and the light will flash and default back to two wheel drive. check the fluid level in the transfer case and front differential for a sign of internal failure. that is causing the grinding sound.

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1 Answer

My '96 Suburban 1500 4x4 won't shift into 4 wheel drive. When I push the button for 4 Hi the light just flashes and stays in 2 wheel drive.


the electric shift motor on transfer case is bad, replace and it will work great. if your at all mechanically inclined you can do this very easy. before unbolting motor disconnect battery to reset computer install part, should only take you 15 min maybe then hook up battery and you will have 4 wheel drive again. good luck

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1 Answer

Will not go into 4 wheel low


Make sure you have it in (N) before shifting it. Did it work before?

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When you are finished with your 4 wheel drive,put the transmission in neutral, disengage 4 wheel drive and shift to reverse then back up a couple feet before shifting to forward gear.

Jan 15, 2010 | 2005 GMC Sierra

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2005 GMC 1500 transfer case does not work below 50 deg


My 2005 Serria 4x4 truck will not work in 4 wheel drive high or low, but my Auto 4 wheel will work. Is there something wrong in the transfer case with electrical or mechanical?

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Wont shift back from 4x4 low, to 2x2


I also have a 2002 Envoy. Shifting to and from 4wh and 4wa can be done on the fly but shifting to 4wL has to be done stoped and while in neutral. Try that. Otherwise I'm afraid its a new computer for you. Its located under the left rear seat and you need a loan for one.

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1 Answer

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switch to the auto 4 wheel drive in park. reverse truck and then put it in neutral and try to switch back to 2 high

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