Question about 1991 GMC Sierra

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I have a 91 Chevy 1500 4 wheel drive! If I select any gear it will not go into gear! If input it in 4 wheel low or high and get under truck I can turn the transfer case shaft and it will lock into gear! I can then start the truck and put into reverse and it will go into gear! But when I put it in 2 wheel drive it will not lock in even when I get under truck and turn the transfer case shaft! I can go from reverse to drive in 4 wheel after I get it locked in from under neath and it will not go in! I can put the truck in neutral in four wheel drive get under truck while it is not running get the transfer case shaft to lock in and crank the truck and it will go into gear! All except 2 wheel high it will not do anything

Posted by Anonymous on

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6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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Jerry Cassel

  • 78 Answers

SOURCE: four wheel won't engage

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)

Posted on Dec 29, 2008

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john barone

  • 59 Answers

SOURCE: 4wd will not engage on 2002 gmc sierra 1500

try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)

I’m happy to assist further over the phone at https://www.6ya.com/expert/john_2c7bb9c157d0baa8

Posted on Jul 04, 2009

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