Electronic 4x4 shift?

55

Asked by Jul 09, 2009 at 01:58 PM about the 1997 GMC Yukon SLT 4WD

Question type: Maintenance & Repair

I have a 1997 Yukon with 225000KMS.     I bought the truck with the 4x4 not working and i am trying to diagnose the problem so i can buy the right parts for it and take the right course of action.

It has the electronic shift on the buttons on the dash (2HI 4HI 4LO)

when i push the  4x4 button, the light for 4 hi blinks but never stays solid, and the front wheels do not engage at all.  If i put the truck into "4LO" the transfer case puts the gearing to "low range", however the light constantly blinks and the front wheels do not engage.  

I know there are 2 actuators, one for the transfer case and one for the front axel or diff or something.  I am wondering if it might be one of these 2 actators, or if it could be something in the transfer case, or what?

If anyone heere has had any experience with this, please let me know what you think and what i should check for.  when the vehicle is in 2wd should the front drive shaft turn? I haven't checked whether or not it does but i am thinking of checking that.

Any assistance (that isn't a form of advertising for any auto parts website) is greatly appreciated

2 Answers

105

well if your transfer case is going into low range then the T/C is operational.... i would check the front diff actuator, unscrew it and shift to 4wd and see if it extends.. may take a few seconds as it uses a heater to het up oil and expand to actuate the front diff.... odds are the problems lies in that.

5 of 5 people found this helpful.
30

I am having the same problem w/ my 97 GMC Z71. Did u figure it. out

3 of 3 people found this helpful.

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