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Why won't my 4 wheel drive engage on my 91 GMC Sierra I shift into 4hi or 4low and nothing. It doesn't engage the front wheels and the indicator light on the shifter does not come on.?
Wiki User
∙ 14y ago
Had that happen to my 90 GMC PU. 4WD didn't work and the light on the shifter on the floor didn't light up - just like yours. I don' know what the part is called technically, but the shop mechanic at the dealer called it a donkey dick. Apparently, they go out about every 10 years. It cost about $125 as I recall and it's a 5 minute job to take out the old one and put in the new. It's some kind of electric switch close to the front end that electronically engages and disengages the 4WD. My son-in-law got under the front end and it looked like it was located close to the front axel. He didn't have to jack it up or anything.
Wiki User
∙ 14y ago
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