Question about 1998 Chevrolet K1500

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Replacing 4WD actuator

Need to know how to replace 4WD actuator and it's exact location.

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It is located by the front pumpkin should be 4 bolts I believe that hold it in and 1 connector

Posted on May 28, 2009

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Posted on Jan 02, 2017

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Where is the vacuum shift motor located?


Gordon, I will take a guess, the Vacuum shift actuator/motor is located on the front axle. Check the attached pictures of actuator and how to replace video,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."
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Front Drive Axle 4wd Vacuum Disconnect Motor 1AFWA00007
Front Axle 4 Wheel Drive Actuator Replacement 4x4 Dodge Ram

May 18, 2016 | 1983 Dodge Ramcharger

1 Answer

DOES A 1990 DODGE DAKOTA HAVE A 4 WHEEL DRIVE ACTUATOR? IF NOT, WHAT ENGAGES THE 4 WD?


If it is electronic activated 4 WD, this system has a transfer case control module located in the dash behind the climate controls.It can go bad and cause the system not to engage the 4WD. May want to check power and ground to the module first.

Feb 23, 2015 | Dodge Cars & Trucks

1 Answer

Service 4 whell drive on dash I replaced front actuator and encoder motoron gmc sierra but still no 4 wheel drive I also changed the dash switch all fuses are good what ami missing?


The 4WD transfer case encoder motor position sensor or the selector switch may fail causing the service 4WD message to be displayed. Fault code(s) stored in the transfer case control module will be of assistance in determining the exact fault causing the message to be displayed.
I have found out that usually the two ground wires that are attached to the frame right under the front of the driver's door is the culprit that causes the 4wd selector switch in the dash to go bad. Chevy had the bright idea of applying the undercoating and/or not cleaning the point of contact of the ground wires before they bolted them to the frame therefore overtime moisture, dirt and corrosion affects the contacts of the threads of the bolts which are the only source of ground the two sets of wires have. There are 2 things you will need to do. First you will need to take the bolts out and use a wire brush to clean down to the metal of the frame as well as the bold threads and ends of the wire attachments and then reattach the ground wires to the frame (time to complete - less than 5 minutes). Second you will need to replace the 4wd selector switch in the dash. You can purchase this online from Amazon (Dorman 901-062 4-wheel drive switch for $31.15 - no tax or shipping and handling). To replace, gently pull the outer trim of the dash out by using just your fingers. You do not need to completely remove it, just pull it out far enough so that you can pull the old switch out of it slot. Then unplug the two plugins located in the back of the switch. Plug them into the new switch and push the switch back into the slot and then push the trim back into place (time to complete - less than 5 minutes). This should take care of your problem. Most often, people make the mistake of just switching out the dash switch and when that does not correct the problem they then replace the more expensive and time consuming actuator motor and location indicator on the transfer case that does not need to be replaced. I should point out that when the Service 4WD light comes on

Jan 17, 2014 | 2000 GMC Sierra

1 Answer

4wd not working replaced actuator when i press button it sounds like its engaging but it isnt actuator is tight so seems like vacuum works but actuator doesnt compress diaphram have vacuum switch on...


Sure sounds like the vacuum switch is not working properly. You have done exactly what I would have done, start with the actuator(most common problem) and go from there. If your not getting the vacuum , then most likely the vacuum switch is your problem.

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Nov 30, 2010 | 1997 GMC Sonoma

2 Answers

The lights for the 4x4 on the dash dont come on and the four wheel drive doesnt engage


Slow or no Engagement of Front Axle when 4WD is selected (Replace Front Axle Actuator) Inspect the Electrical connector from the indicator switch located on the upper right side of the differential.

Replacing the actuator itself is a pretty simple job.
Remove the connector.
Unscrew the actuator.
Put some goo(thread sealer) on the threads of the new actuator if it doesn't already have it.
Screw in the actuator.
Plug in connector.

Replacing the transfer case switch will take more time.

Good luck and keep me posted. Glad to help you get your Tahoe running 100% again soon and thank you for using Fixya.

Mar 04, 2010 | 1999 Chevrolet Tahoe

2 Answers

I have a 2002 Chevy Silverado 8 cylinder 4wd extended cab. It has the push button shifter for 4wd. When I try to use 4WD Auto or 4WD Hi, the indicator lights come on but the 4wd does not engage. I read...


Fuse is located at the end of eh dash on drivers side and the Actuator is located at the front differential and on the passenger side.
When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the grinding.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 88-99 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

Feb 03, 2010 | 2002 Chevrolet Silverado

2 Answers

I have a 2002 Chevy Tahoe making a grinding noise in the front drivers side wheel, what could this possibly be?


If 4wd Tahoe, it is the CV joint going out or is out, replace part about 250 bucks, very common in 4wd Tahoe

Jan 11, 2010 | 2000 Chevrolet Tahoe

1 Answer

4wd will not engage on my 1996 GMC Sierra 1500 pickup


Ok the drive shaft will spin thats good. remove the front driff actuator and see if the plunger extents. if it doesn't check that the power and grond ar ok. If they are then replace the actuator. Just so you know the two actuator may be diffrent. If it has been replaced no problem. If it hasn't ever been replaced then ther is a updated part it come as a kit witha harness spacer and actuator.

Dec 14, 2009 | 1996 GMC Sierra

1 Answer

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.

May 12, 2009 | 2001 Chevrolet Silverado 1500

1 Answer

2004 Toyota tundra four wheel drive won't engage when I push the button.


Does the 4wd icon on the dash blink when you try? The most common problem I have seen is the 4wd actuator sticking. Its mounted towards the rear of the transfer case on the drivers side(US). It has about a 3inch electrical plug on it. Locate it and with the truck running have someone push the 4wd button while you lightly tap on the actuator motor. They can sometimes stick from lack of use. If it doesn't free up it may need to be replaced which is rather involved. The transfer case would need to be removed and opened up to replace.
Good luck.

Mar 19, 2009 | 2004 Toyota Tundra

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