Question about 1990 Chevrolet K1500

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1990 k1500 I from 4wd to 2wd the front axle stay's locked in. I have to take the actuator out wiggle the "pin" inside the differential to unlock it.

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  • Chevrolet Master
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The pin may be locked in because of torque wind up from driving on hard surface in 4wd . Check power/ vacuum to actuator as well. Run on grass / mud/gravel/ ice surface as you try to unlock 4wd to allow the torque wind up to disappear.

Posted on Feb 15, 2014

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Posted on Jan 02, 2017

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alicantecoli
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SOURCE: Noise coming from front differential

new wheel bearing need by the sound of it

Posted on Jan 31, 2009

  • 59 Answers

SOURCE: front axle differential on 2000 chevy silverado

Your pickup leaks just like everyone elses. what you need to do is go down to your local parts store and get an inline fuel filter (your local chevy dealer should also have these available just for this problem), preferably see thru then, where your vent runs up the inner fender cut the line about 4 inches down from the vent and install the filter. this will cure your problem

Posted on Jul 28, 2009

dennymulford
  • 1055 Answers

SOURCE: rear brakes locked up. 1990 chevy c1500 2wd pickup

did you see if they need replaced?
and also the emergancy cable may be froze

Posted on Aug 12, 2009

  • 144 Answers

SOURCE: 1990 chevy blazer 4x4 full size,,would like a

Hi! Here you go!! hope this helps you!ae5521f.gif

Posted on Sep 12, 2009

Testimonial: "thanks for the diagram.. very helpful in replacing my front hub assemblies..."

  • 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

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1 Answer

How do I remove the spindle axle on a 2001 dodge ram 1500 2wd? And what is the name of it exactly?


The spindle is what holds the front tires on. The axle is what holds the rear tires on. To remove the spindle, you have to remove the brake caliper first the remove the ball joint nuts. hit the spindle were the ball joints go in. The shock will release the ball joints. To remove the axles, you have to remove the differential plate, spin the differential until you see the bolt that locks the center pin in. remove both. push in the axle and remove the C clip. pull the axle out.

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Torque Specifications

Description Nm lb-ft Axle-to-frame bolt 66 49 Axle damper-to-frame bolt 34 25 Brake caliper guide pin bolt 33 24 Differential bearing cap bolt 61 45 Differential housing cover bolt 29 21 Ring gear bolt 122 90 Tie-rod nut 91 67 U-joint spider retainer bolt 19 14 Upper ball joint pinch bolt 48 35

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2003 gmc envoy 4x4 problems. 4200 vortec engine. my front diff doesnt seem to be


The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following components:
• Differential Carrier Housing
• Differential Case Assembly
• Inner Axle Shaft
• Intermediate Shaft Bearing Assembly (located on the right side of the oil pan)
• Electric Motor Actuator
The front axle on Selectable Four Wheel Drive (S4WD) model vehicles uses a disconnect feature mounted on the right side of the oil pan in order to engage and disengage the front axle. When the driver engages the 4WD system, the Transfer Case Control Module sends a signal to the electric motor actuator to energize and extend the plunger inside. The extended plunger moves the clutch fork and clutch fork sleeve across from the clutch fork outer gear that is splined to the right side wheel drive shaft to the clutch fork inner gear that is splined to the inner axle shaft. The locking of the two gears allows the axle to operate in the same manner as a semi-floating rear axle. A propeller shaft connects the transfer case to the front axle. The differential carrier assembly uses a conventional ring and pinion gear set to transmit the driving force of the engine to the wheels. The open differential allows the wheels to turn at different rates of speed while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners and premature wear on internal axle parts. The ring and pinion set and the differential are contained within the carrier. The axle identification number is located on top of the differential carrier assembly or on a label on the bottom of the right half of differential carrier assembly. The wheel drive shafts are completely flexible assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a wheel drive shaft.

How To Install Repair Replace 4x4 Front Axle Actuator Chevy Trailblazer...

May 11, 2017 | 2003 GMC Envoy

2 Answers

I have a 96 chevy 4x4 and my front wheels aren't pulling. i replaced the acuator and still nothing. 4x4 light flashes in 4L and 4H. what could be the problem. is there auto locking hubs on that model...


no there is no auto locking hubs. 96 chevys have a ifs (independent front suspension) this give it more ground clearance but does not have lock out hubs, the cv axles go into the front differential an spin freely until you put it in 4wd, how this works is your transfercase spins the drive shaft that goes into the front differential an while you put it in 4wd it sends power to the actuator to lock the front differential. if your front end isnt pulling you either popped your 1 of your cv axles but if you did this you would know because it makes a very loud thunking noise while you're driving, my guess is you have a short thats not sending power to the actuator. check to see if the wiring harnesses are connected and check if the fuse that operates the 4wd in the cab of the truck is not blown. also actuators for these trucks are horrible they go out alot. also you can try reversing a few feet putting your truck in neutral an then try putting it in 4wd

Feb 11, 2011 | 1996 Chevrolet K1500

1 Answer

I need to remove the front axle out of the differential on a 2003 Dodge Ram 1500? What is the best way to pull it out. I already have the half shaft taken off I just cant get the solid axle out of the...


when removing the front axle i believe that you must open the front differential cover and inside the dana you will see a small 8mm bolt located on the spider gear center it holds the pin bar in place and the pin bar holds both the upper and lower gears in place with a small washer below them. be careful when you pull the pin bar out to make sure the gears stay in place (upper and lower) do not let the washer fall out of the spider cage assembly. Then, carefully slide the U pin that holds the axle in (there are two of them one for the left axle and one for the right). Once the U pin slides off the axle the axle should slide all the way out of the whole differential - Note if the U pin you see at the end of the axle does not come off easy just push the axle IN ward towards the center of the differential and then slide it out with a small screw driver ..

Jan 12, 2011 | 2004 Dodge Ram 1500

1 Answer

I removed the 4wd actuator on my 1997 1500 gmc located on the front differential and pressed the 4wd hi button in the cab. The actuator traveled out. I then pushed the device inside the differential...


4wd actuators are in the transfer case not the diff housing
on a diff housing it is more likely to be a diff lock to lock the 2 front wheels together

Jul 02, 2017 | GMC Sierra 1500 Cars & Trucks

1 Answer

Front diff growl in 2wd


This would be a failing bearing in the differential. More specificly, I would suspect the pinion bearing. The differential will need to be disassembled and all (4) bearings and bearing races inspected for wear/ pitting.

Mar 24, 2010 | 1997 Chevrolet Blazer

1 Answer

1991 K2500 pickup, 350tbi,4l80 trans, 4wd not working, I have gotten it to turn on a couple of times but it never stays working. The transfer case does lock in when its put into 4wd. also the actuator is...


On the full size, the front actuator is electric, not vacuum.

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.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 1994 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

Jan 10, 2010 | 1991 Chevrolet K2500

4 Answers

The 4x4 does not shift into 4 wheel drive not 4 hi or 4 low


Check the fuse to the 4x4, if the fuse is good then check the 4x4 electric motor actuator on the transfer case. You should hear it work from 2wd, 4hi to 4low and back to 2wd with the push of the switch. if you don't hear it working then check the wire harness at the actuator motor, look for any damages like corrosion or cracked wire connector clips. If the 4x4 actuator is working on the transfer case, then the front hub 4x4 actuator may have gone bad and that's located on the front differential. It's common for the clip there to corrode and break and is an easy fix with a new collar pin, at worst it's the diaphragm on the vacuum actuator that is located under the battery tray. There is a vacuum switch on the top of the transfer case, driver side but when that fails, your front hub stay's locked in the on position. Good luck and keep me posted and hope it's a simple fuse that has gone bad. You can pick up all these parts at Auto Zone or Parts Source and they will have the step by step instructions for you to get the job done with common tools.

Dec 13, 2009 | 1996 Chevrolet Blazer

2 Answers

My four wheel drive doesnt work on 97 jimmy but clickes when i push the button?


there is a vacuum actuator under the battery it could be leaking vacuum. There is also an electric actuator on some models found in the same place. There is a cable that runs from the actuator to the front differential that locks it in. Make sure you have vacuum and the actuator is pulling the cable when 4x4 is engaged. hope this info helps.

Dec 09, 2009 | 1997 GMC Jimmy

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