Question about 1991 Chevrolet S-10

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My chevy s10 wont lock in 4 wheel drive - 1991 Chevrolet S-10

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Check the vacuum lines that was the problem with mine. Mine would lock but not engage.

Posted on Aug 13, 2011

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Put the truck in nutural then put it in 4x4 then put the truck in reverse back up about 10 to 15 feet and it should be locked in. to take it out the same thing nutura,l 2by, reverse. hope this helps

Posted on Feb 07, 2010

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Posted on Jan 02, 2017

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SOURCE: chevy s10 4 wheel drive will not engage

There is a vaccuum operated switch located on the transfer case that sends vaccum to the accuator that pulls a cable that locks the front end in. Check for vac coming in and out of this switch if no vac out replace it. This switch is a very common problem. You can find them at most parts stores in the help section #49315. please rate.

Posted on Dec 08, 2008

  • 33 Answers

SOURCE: 1994 chevy s10 blazer 4x4 push button type

small sylinoid on the top of the transfer case needs replaced. easy to do. it has three vacumelines going to it just trun out and replace like a bolt.

Posted on Dec 13, 2008

SOURCE: 2000 chey blazer s10 wont go into 4 wheel drive

Need more information, but try to engage with engine at idle and transmission in nuetral and then slowly put into gear. Some vehicles will only engage 4wd system in D for Drive not the D with the circle around it for Over Drive, due to speed restrictions on the system. 4H is used for inclement weather and snow for highway use or cruising off road. 4L should only be used OFF road not on pavement and for slow speeds only. If that does not work put in drive and slowly move vehicle forward with 4wd switch engaged shift to nuetral while coasting and then put into a forward gear NOT reverse and it should engage, make sure you do not have locking hubs as well, I don't know many vehicles that have locking hubs as of late, but I could be mistaken. Hope this helps. Other post have also stated that the 4wd switch could be faulty, and can easily burn out.

Posted on Jan 11, 2009

Keith100881
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SOURCE: 1991 S10 blazer 4x4 4.3 popping coming from the front

the popping sound is the stabilizer links or the lower control arm bushings you can replace all bushings and both link kits for around 50.00 and the light is prob from the sensor on the transfer case or the front end i would remove and clean with dawn dishwashing liquid and put them back.

Posted on Jun 23, 2009

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SOURCE: 1998 Chevy S10 front axle will not engage when put into 4 wheel

Normal thing that happens as long as onone (worked) on it, is the vacume hose going to the engage sevevo under the battery box has fell of on either end or is brocken on the way there. Then the once or now leaky battery acid ate up this same servo. then the cable going to the front axel breaks sticks falls off or even someone needing one climbed under your truck while parked somewhere to get one to replace their brokeen one now you don't have one then theaxel engage arm or gearset is damaged

Posted on Aug 16, 2009

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