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spencer huth Posted on Dec 14, 2012
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89 gmc sierra 1500 4x4 wont go in and the transforcase works just the front axel wont engage

I put the back up on jack stands and put in gear and the front drive shaft spines but front tires and going any where help?

1 Answer

Justin Scott

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  • Expert 118 Answers
  • Posted on Dec 14, 2012
Justin Scott
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Joined: Dec 14, 2012
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There is an electric switch on the front axle toward the passenger side. These are notorious for failing and they aren't too expensive. If you have a test light you can check for power at the wires before you replace it.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/justin_3ae27a9d61d6acd4

Testimonial: "it turned out to be the inner axel shaft , the c clip on the end had worn down and it would pull out and disengage its self"

5 Related Answers

gmiller442

  • 17 Answers
  • Posted on Jan 31, 2009

SOURCE: 4x4 wont engage

First thing to make sure of is to check for a blown fuse. The fuse location is marked 4WD and it should be a 25 amp fuse. If the fuse is bad, the lights on the 4wd console wont light up. If the lights do light up, then you can move to the transfer case. On top of the transfer case, toward the rear of the truck is a switch that has a 2 wire connector. That switch sends power to the front axle actuator when you try to enagage 4wd inside the truck. That could be bad. The switch is threaded into the transfer case and is still available through GM. If the switch is ok and the wiring that attaches to it is ok, then you can move up to the axle. Threaded into the front axle is the front axle actuator. These actuators are prone to failure in older trucks and is very prone to cold weather failure. You can test the actuator by removing it and then WITHOUT the truck running, put the truck into 4wd and then turn the key to the hot position. The plunger inside the actuator will extended outwards. More than likely it will be one of those 3 things. If it still wont engage, you may have a short in one of the wiring harnesses associated with the 4wd system. Also, you may have a damaged transfer case. To check the transfer case, put the truck in 4wd without it running and then crawl underneath and see if you can turn the front shaft by hand. If not....it's good. If you can....then the shifter forks inside the case are worn or damaged. I hope this helps.....start small and work your way up!

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Anonymous

  • 2 Answers
  • Posted on Feb 16, 2009

SOURCE: 2008 GMC 2500 Sierra - Change factory tire pressure setting

Let me understand this.. I ask you guy's a question and before you send me the answer, you want to charge me. Then you ask if I resolved the problem and if so, tell you how I did it. Well I did resolve it and I would be more than happy to tell you how. $29.95 with get my detailed response.

Anonymous

  • 15 Answers
  • Posted on Dec 30, 2008

SOURCE: '95 Suzuki Sidekick 4wheel drive problem

I maybe able to help. Did it make any noise when you tried (grinding or groan hum exe..) or just not work. If so the first thing I would do is to change the transfer case oil, check for metal in the oil, if there is that's really not good, take to shop. If no shinny metal replace with good quality oil, if it's red use atf if black or brown use 75W 90 and some. Auto trans fluid is recommended in cold climates or adding torque modifier check with parts store or dealer prefferably for what to use unless comfortable with choice then change front differentail fluid, with recommended fluid and torque modifier for limited slip differentails 2oz or alittle more. both holes fill till you can stick your finger in an just bairly bend it 1/8 or so inches and touch fluid. don't try to fill all the way if it comes out of the whole your filling clean up mess and allow as much to drain out as possible. If that happens you may have it vent through the vent and may see/ smell what every you put in it. If your comfortable with taking the diff cover off and replacing the gasket if needed (usually is) make sure its clean, don't use water or anything water based brake clean is good but check for metal and brownish or simial colored stuff in bottom of housing and of course metal. The teeth on the ring gear and pinion( ring gear is the small one in the back, ring gear is big and will be closest to you. if you have hunks of metal in there its smoked and replacement of ring gear and pinion is required (not cheap) there is alot more to look for but that should start you off in the right direction.

Anonymous

  • 1 Answer
  • Posted on May 27, 2009

SOURCE: 2000 Gmc Sierra. 4wd wont engage, buttons on dash just blink

I had the same prob with my 2000 GMC Sierra 4x4 z71. They replaced the 4wd module in the dash and everything worked after that. Was about $200. The part itself was about $150.

john barone

  • 59 Answers
  • Posted on Jul 04, 2009

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

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Will not go into 4wd Hi or Lo

Raise the truck with all 4 wheels off the ground, use jack stands for safety, Start the truck, engage 4hi/4lo operations , put in drive, take foot off the brake and see if the front drive shaft is turning the front diff.
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1998 GMC Sierra K2500 Wont go in to 4X4

Switch has high failure rate. If that's the one mounted on the left side of the instrument panel.
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By any chance have you jacked up the front of the truck and set it on jack stands. And engage your 4x4 and see if your wheels turn at all. You might have a hub problem they might not be engaging on your front axle.
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2002 GMC Z71 WHEN PUTTING INTO 4WD YOU CAN HEAR TRANSFER CASE LOCKING BUT FRONT TIRES WILL NOT TURN.

Hello tmaxx31190
Start by checking fuse #7 a 15amp fuse in the fuse block under the left side of the dash. This fuse is for the accuator motor on top of the left front axel tube. The accuator moter engages and
disengages the front axel for 4wd and 2wd. If the fuse is good, have someone operate the switch
and check to see if the accuator is working, you should be able to hear it engage or disengage.
If it's not working check the connections and for power at the accuator before possibly changing it.
If the accuator is working, it could be a problem with the shift fork inside the differential. Also, have
someone start the truck and engage the 4x4 then look to be sure the output shaft from transfer case to the front axel is turning. The safest way to do this is to have all 4 wheels up on jack stands.
Hope this is helpful.
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GMC '91 Jimmy, Transfer case. When in two wheel drive I hear a slight grinding noise and rattling noise. When in 4 wheel no noise. 330,000 miles, could something be worn? What keeps the transfer case gear...

Remove the transfer case and strip it down,wash it out and replace whatever is worn.
330,000 miles is unrealistic
Your chain is worn and stretched for sure, and rattling and may be cutting into the case.
Don't install another salvage yard unit, unless you can not repair yours. Then strip down whatever you purchase, and go thru it also.
10helpful
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4 wheel drive will not engage on my 1989 gmc sierra 2500?

actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle
7helpful
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1992 chevy k2500 4 wheel drive not engaging. was driving in 4 high with no problems. shut truck off and no 4wd. no lights and no 4wd. new rear end, new transmission.

I have a 19934x4 bought it with 4 wheel drive notworking. indicator lights for 4x4 would notlight up but transfer seemed to be shiftin ok. frontaxel woul ot ingauge. I repled the front axel actuator an works fine now no problem. actuator is on the passenger sid back of the front axel pigand has a plug, mine was 2 wireroundpin plug but some have a flat pin 4 wire plug. 70 dollars at NAPA. wasa realy simple replacement didnt even need to jack up the truck. the actuator h a pin that electronically puses out engauging te front axel. a easy test is to put the truck in 4 wheel high. holdthe brak and givei little gas ad havesomeoneelse stand to the side ofthe front of the truck and see if the front axel spins. ifso th actutor is te most likely prblem. hope this helps.
1helpful
2answers

2000 Gmc Sierra. 4wd wont engage, buttons on dash just blink

I had the same prob with my 2000 GMC Sierra 4x4 z71. They replaced the 4wd module in the dash and everything worked after that. Was about $200. The part itself was about $150.
3helpful
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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.
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