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4wd silverado 2500 hd

4 wheel drive will not engage. The 4 wheel drive will engage at the transfer case but will not spin the front tires. Checked the actuator and it seems to be working fine.

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  • 82 Answers

Check the oil in the transfer case. If it has lots of metal in it... time for a new one. They aren't the world's strongest.
Another check: Lift the front of the truck, while keeping the rear wheels on the ground. Engage the 4x4 switch (then turn the truck off) crawl under and try to turn the front driveshaft by hand. If it turns and the wheels turn, the transfer case is the problem if it turns but the front wheels don't... front diff issues. Any grinding, crunching etc is also a clue.

Posted on Dec 30, 2013

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6ya6ya
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Posted on Jan 02, 2017

  • 6982 Answers

SOURCE: 99 Silverado 4-wheel drive not engaging

It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn.
good luck

Posted on Mar 19, 2009

robslac24
  • 2 Answers

SOURCE: 01 Chevy Silverado 4 X 4 not working. 4WD light

Having the same exact problem but with my 1999 escalade. Thought it was the actuator bought a new one installed it transfer case would engage but front end wouldnt lock. Took it out of housing left it plugged in got a friend to go through all the 4wd for me and the plunger never moved out the actuator. Checked my wiring harness which is a four prong ann it had one hot prong like it is suppose to. Traced wires even replaced dash switch same problem. Taking it to local dealership tom to have it checked for codes. I was told it could be the transfercase actuator even though its workin that actuator is what sends power to the front to engage the actuator to lock the differential.

Posted on Sep 16, 2009

  • 1168 Answers

SOURCE: 4 wheel drive will not engage front axle.actuator

On the front axle of your Suburban there is a thermally (an internal heater) activated devise that pushes on a lever to engage the axle. There is a technical service bulletin ( #76-43-01A) on this problem but the repair isn't cheap.It involves installing an updated devise with a DC motor from General Motors which also requires a new wire harness.
I have found that installing an aftermarket one (available at your local autoparts store) that just bolts on will work just as well.
It just threads in to a housing and is very easy to replace.

Posted on Nov 02, 2009

gladys_neal
  • 334 Answers

SOURCE: I have a 2001 Chevy 2500 4X4. Four wheel drive not

Sounds like the chain in the transfer case has broke or the linkage is out of adjustment

Posted on Dec 08, 2009

  • 33 Answers

SOURCE: 1996 dodge ram 2500 4x4 won't engage. no

Your transfer could be bad.

Posted on Dec 13, 2010

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WHY DOESNT MY 4WD WORK


Sounds like you have snapped the Pin in the front pumpkin or a gear has broken. Is their any clunking up front when in 2wd?

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Does the driveshaft for the front wheels turn when in 4wd? The actuater might work but the diff lock for the front wheels might have broken. If the front driveshaft does not turn when in 4wd, the transfer case might be the problem.

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Front axle does not engage. Push 4hi or 4lo button, transfer case motor engages front drive shaft, front diferential actuator extends, but no 4 wheel drive. What do I check next?


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What is auto 4 wheel drive?


Auto 4 wd is when the Silverado's PCM takes readings from the front and rear driver shaft and when there is any detection that the speeds are different. The Auto 4WD will activate the transfer case to lock it self to 4wd until the front and rear drive shaft are running at the same given speed of rotation.

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Aug 24, 2010 | 2000 Chevrolet Silverado

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Four-wheel drive does not engage - 2008 Chevy Silverado 2500 HD - Just bought the truck from a dealership yesterday. Tried to engage the 4WD today. The light on the dial came on, but the 4WD did not...


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Jun 19, 2010 | 2008 Chevrolet Silverado 2500HD 2WD

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My 2002 2500HD 4x4 front axle not engaging


Try jacking up one side of the front and putting it on a jackstand. Then turn key on(but dont start it) and put it in 4hi. Try to spin the tire in the air. The drive shaft should not turn nor the wheel. If the wheel does then maybe the acuator is not moving in the axle. It worked when you pulled it out but it might be hanging up on something in the axle.

Dec 31, 2009 | 2002 Chevrolet Silverado 2500HD

1 Answer

99 Silverado 4-wheel drive not engaging


It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn.
good luck

Mar 19, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

Transfer case wont engage


shift into 4wd and move truck a couple of feet.
if light is still off, park truck block the wheels set the park brake jack right front wheel and try to hand spin the wheel if wheel doesn't turn 4x4 is functioning properly but there is a wiring problem use an ohmmeter to check the 4x4 switch wiring fuse and bulb
if wheel turns freely the front axle or transfer case is not engaged
attempt to hand spin the front driveshft if the driveshaft will spin the transfer case is not engaged check the transfer case shift linkage, problem is in linkage or transfer case internals
if the driveshaft will not spin the transfer case is engaged properly
with trnsmission in neutral or park start engine measure vacuum on the two vac lines at front axle shift motor . one line should have approx 20" vacuum. other line should have none
if no vacuum measured look for vac leak or bad vac switch
if both lines have vac look for a bad vac swithc or ruptured cad actuator diaphragm
if one line has 20" +- VAC
move transfer case lever to 2wd measure vac again lines should have swapped vac signals
if no vac switch bad or 4wd shift likage needs adjusting
if yes vac motor bad or stuck or shift fork stuck
remove vac shift motor from the axle attach vac lines to shift motor engage disengage 4wd
does shift motor plunger move at least 1/2 inch
no shift motor bad
yes check axle shift fork and vac motor for binging

Jan 27, 2009 | 1999 Dodge Ram

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