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4 wheel drive actuator

I ran over a dead deer on the highway and it messed up my truck, so I got everything fixed but now it won't come out of 4wd

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 12 Answers

SOURCE: Chevy Tahoe 2001

Place vehicle in 4wd (high or low). This will hold the front drive shaft still for the rest of the test. Jack up the front end of the vehicle. Remove the actuator. Have a buddy spin the right front wheel while you use a long punch or screwdriver to try to manually engage the diff. The left front wheel should spin in the other direction if the diff is good. Also before you check the diff you need to grab the front driveshaft and make sure it is locked, If it spins freely when the truck is in park and in 4wd with the front end raised then problem is in transfer case. If you can't make the diff engage manually with punch then the problem is in the diff. If front diff engages manually then the problem is the actuator. Hope this helps..

Posted on Nov 27, 2008

  • 1 Answer

SOURCE: Front wheels do not turn

I did run the vehicle on the lift in 4wd. The actuator is trying to engage. I removed the right side axle housing and found the shim on the end of the shaft had fallen out of place. The small roller bearing in the shaft was damaged as well. This may have happended on a previous axle seal replacement. A new shim, and bearing fixed the problem. Thanks for our reply

Posted on Nov 28, 2008

  • 1 Answer

SOURCE: 4/04 ford f150 4x4 front axle actuator won' t stay disengaged

Even though you checked the vacuum lines and found no leaks it does not mean there isn't a problem. The check valve in the line closest to the firewall actuator is probably your problem. Had the same issue replaced this line and solved it. The check valves in the vacuum lines are your best next guess.

Posted on Jun 23, 2009

  • 12 Answers

SOURCE: 1992 chevy k2500 4 wheel drive not engaging

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.

Posted on Dec 20, 2009

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SOURCE: My 1999 chevy silverado 1500 four wheel drive

You probably have a bad encoder motor.It is located on the side of the transfer case on the drivers side.It is black.The other problem they had with these was the switch but you have already replaced this so your next thing is the encoder motor.Hope this helps.Good luck.

Posted on Dec 28, 2009

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1995 land cruiser hdj80 4 wheel drive not working


Tracy, May be a 4x4 actuator problem, you may have to take it into a good transmission shop.Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

1995 4runner will not engage into 4wd

Is this the actuator for 4WD my 4WD won engage

EBay 1995 TOYOTA LAND CRUISER REPAIR MANUAL

Mar 22, 2016 | Cars & Trucks

1 Answer

Hi, I have a 1996 chevy S10 Blazer 4x4 and after getting all 4 wheels off the ground have determine that when I put it in 4 wheel drive the front driveshaft (from the transfer case) does in fact turn


the front drive shaft when locked in 4 WD does drive the front diff
that inn turn drives the both front wheels if both have the same amount of traction
if one wheel is off the ground then the other will spin at twice the speed as that is what a differential is designed to do
now if you have a problem diff center ( broken teeth etc ) the there will be awful noises, clunks and bangs as the teeth from the pinion and crown wheel mismatch and hit on each other
no noises when in 4WD indicates a good diff center
the next problem will be a broken axle at the splines into the diff center spider gears ( same as one wheel off the ground or in a bog) the only wheels doing the driving are the rear wheels
next are the "u" joints or cv joints but again there will be lots of noises involved
lastly and the most frequent is the drives at the hubs
depending on the hub locks you have it will not n be locking in one or both wheels due to faulty actuator , dry damaged locking mechanism, stripped splines or not manually engaged
understand this --unless you have limited slip differentials or diff lockers on the vehicle any 2 opposing wheels or any wheels on the same side that have lost traction and regardless of being in 4WD or not you will not be going anywhere
so to fix --start at the drive hubs both sides to check actuation , engagement , then work back into the diff

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1 Answer

2004 Buick Rainier four wheel is stuck in AWD drive all the time .


All wheel drive is just that-- All wheel drive-- not to be confused with 4 wheel drive . The difference is with AWD there is a 3rd diff in the transmission that allows the front and rear wheels to operate at different road speeds . When 4wd is selected that 3rd diff is locked and so both front and rear wheels drive at the same speed regardless of ups and downs in the road surface . This results in a torque wind up in the drive train and places load on "U" joints --splines --CV joints and gear teeth . The grinding on turning corners will be the CV joints trying not to flex because of the torque wind up . How to prevent this problem=== Do not use 4wd on hard road surfaces === as the tyres cannot slip to relieve the torque Restrict the 4wd use to snow , mud and loose surfaces TO fix the problem unselect 4wd drive and reverse several yards to release the pressure in the drive train and the actuator has a chance to pull the gear out of lock up. If that doesn't work check that the actuator is actually working

Mar 08, 2014 | 2006 Buick Rainier CXL

1 Answer

Front differential noise.


If you were on hard stand and not on gravel or loose surface then you will experience drive line torque wind up which stresses all loose parts in the entire drive train including the gear box and transfer case.. You may have worn "U" joints or cv joints in the king pin /ball joint area If there has been no service on the front drive axles and joints then the problem may be coming from there.

Feb 09, 2014 | Cars & Trucks

1 Answer

2002 Chevy 4wd


maby im wrong but if you rev up and only rear wheels spin that means that it might be 4 wheel drive but not constant 4 wheel drive or diff lock system ,,,, ,, in 4 wheel drive all wheells will turn together but if pressure of slip is bad enough or torque high enough only 2 wheels will drive ,,, thats why diff lock locks wheels together in each axle to over come this ,,, all wheel drive like in landrover locks all 4 wheels together to ensure all wheels rotate to give best grip

Feb 13, 2012 | 2002 Chevrolet Suburban

1 Answer

2005 Trailblazer XT won\'t go into 4WD. Front hubs don\'t engage with switch in cab. It will gear down to 4wd Lo but front wheels won\'t engage. Please help. Can\'t afford the dealer!


i've been told it was the 4wd actuator located on the passenger side near were the cv joint goes in to the front axle a good test is to floor jack it up so both wheels are off the ground and have someone on the other side , put in nutrual turn both wheels one way at same time and the 4wd drive shaft should turn if not its your actuator, costs about $86 for anew actuator and takes about 5 mins to change once you have the tire off

Feb 11, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

I have a 2003 Blazer and it will not go into 4 wheel drive The light will come on but it is not in 4 wheel drive I know because I Buried it last deer season.


There is a Vacuum switch that is on top of the transfer case that will send vac to a actuator located unber the battery when put in 4WD. I would make sure it's getting vaccum and also make sure battery acid hasn't leaked down on to the actuator and cable that goes to the front diff.

Sep 23, 2010 | 2003 Chevrolet Blazer

1 Answer

I ran my hilux in four wheel mode on the highway for about 20 mins. when i stopped on a slight incline the vehicle did not roll down the hill in nuetral. also i had to disengage the wheel hubs to obtain 2...


Same problem in my friends 2008 model ...felt like the brakes were on when driving in 4wd mode ...i.e when backing out of the drive way ...it may have something to do with the transfer case creating more drag ..(it is always good to disengage the hubs .....I live in Central Australia and only use 4wd when towing someone out of trouble)

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Does it sound like a loud winding sound coming from the front right side? I have a 2001 Jimmy and the 4wd tries to engage when driving up steep hills and going at highway speeds. The actuator vacuum switch engaged when the transfer case vacuum switch sends the vacuumed air to the actuator. What is happening is their is either a leak in the vacuum lines, a faulty actuator switch, or a faulty transfer case vacuum switch. When the jimmy has enough air pulling in, the extra vacuum is trying to push the actuator switch in when it is not supposed to. It is a much cheaper fix than a transmission. GMC should have recalled the whole 4wd system on any of the S10's, the JImmy's, and Blazers.

Jul 30, 2008 | 2000 GMC Jimmy

4 Answers

4 wheel drive wont swich back to 2 wheel drive


For a temporary fix so the car can drive, remove the fuse for the four wheel drive. it won't actuate the four wheel. The car is always in 2wheel drive. the fuse is located under the hood, the very right side of the of the fuse box, the third fuse up from the bottom. This can be checked in the owners manual. When I need four wheel dr I place the fuse back in. I haven't fixed the problem yet but can drive it 2wheel on the road. think it is the control module for the four wheel dr located under the dash board behind the glove box. Dealer part for $450, I would rather install and remove a 10cent fuse

Jun 19, 2008 | 1999 Chevrolet Blazer

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