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1991 gmc 4x4 hat I can not get to engage into four wheel drive

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  • 7 Answers

Electronic or manual . If its elec check the switch on the transfer case. Mech. Check the linkage its easier to have someone move the shift lever why you watch what what it does.you might want to spray the linkage.

Posted on Nov 19, 2014

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  • Expert
  • 69 Answers

Stop messing with it before you damage it, first and foremost. Next, check the fluid in the front differential as well as the trnsfercase. Sounds like little to no fluid. If needed, drain old fluid, and replace with new making sure its full. If the systems persist, have a mechanic inspect the transfer case.

Posted on Nov 19, 2014

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Posted on Jan 02, 2017

  • 507 Answers

SOURCE: 1990 GMC Sierra 4x4 1500

the connections near the front axle that activate the motor to engage the system aren't melted? That's a comon problem for that body style. If there good, sounds like it could be that motor itself. To figure out if it's you motor or transfercase, jack up the rear end, have a friend inside shift into 4 wheel drive, or try to, and put it in gear and apply some gas. If the front driveshaft is turning then it's something with the front end. If not, farther back in the system.

Posted on Sep 22, 2008

mattman2112
  • 57 Answers

SOURCE: 4x4 in working

try reversing six to eight feet after shifting into 4WD. PLEASE RATE MY ANSWER.

Posted on Feb 26, 2009

poolgod27ia
  • 1 Answer

SOURCE: 4x4 will not engage in 96 gmc yukon

I just fixed a friend of mines 96 yukon...shift to neutral press 4H and u can hear the actuator make noise (we even replaced it with a new one his idea and the same thing happen as old one), so as he hit the switch for 4H i layed under it (on 4 jack stands) and I could hear the motor on the transfer case make a loud noise (well thats working) and before all this I asked him did u check all your fuses (he said guarnteed to be all good) one night it was bothering me so i looked through the owner manual for the yukon and in the fuse box on driver side by the door there are (2) fuse for the 4wheel drive unit,pull one of the fuses good...pulled the other one and it was blown put in a new fuse and it works like brand new..pull fuse for anything that has to do with 4 wheel drive componants,

Posted on May 03, 2009

JayShelton
  • 3 Answers

SOURCE: My 99 GMC Jimmy has the service 4X4 light on and

I own a Jimmy and have done quite a bit of 4 wheel drive repair on it.
The first thing i would check is the 4x4 selector switch. I know for a fact that these will throw a service 4x4 code if they are unplugged or shorted. They sell for 50-60$ or you may find one at a local salvage yard for cheaper. Taking this out and checking it only takes a few seconds, just simply pop the switch out of the dash with the edge of your pocket knife. After you get it out theres a few more tabs surrounding the back plate, and this is where the circuit board is located. I would inspect it visually to make sure nothing looks corroded and also take a sniff of it to insure there isn't a burnt smell. If it were the 4x4 actuator the lights would still illuminate on the selector switch, it just wouldn't engage the 4x4. You'r problem is all electrical trust me .

Posted on Jan 05, 2010

  • 432 Answers

SOURCE: how to fix four wheel drive on a gmc serria 1500

Good Evening. So from the sounds of it you say the hubs are not engaging, which means you probably checked the driveshaft and saw it moving. There is a actuator on the right hand side of your front differential and has plug in with 2 wires going to it. First off take a test light and hook it between the wires start the truck and be sure it is in 4wd and if the light turns on you need to replace the actuator which is a common replacement item. We only use the 88 and newer chevrolet trucks for our snow plows so I have seen this too many times. If there is no power there is a fuse in the fuse panel then take your test light and check them as well. I hope this helps you.

Posted on Aug 11, 2010

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1 Answer

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2 Answers

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1996 gmc jimmy 4X4


I had a similar problem, only it would not engage. I had my mechanic look at it. He said that there is a pin that when a lever is moved the pin engages the 4x4. My pin sheared off. He replaced it and now it works great.

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