Question about 1992 Chevrolet C1500

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1992 chevrolet 4X4 Z71

With transfer case engaged right wheel spins and the left front wheel spins the other two wheels donot spin was wandering if anybody out there could help me thank you

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I believe that is standard for a stock 4X4, If you have true posi 4X4 all 4 wheels will turn at the same time in your case when the 2 spinning wheels spin under load the other 2 kick in
hope that helps you
Rob

Posted on Jan 19, 2014

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SOURCE:

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Posted on Jan 02, 2017

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johnjohn2
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SOURCE: 96 tahoe 4x4 not engaging the front wheels

then the seloniod actuator if the front diff may be bad, this is common,heres a diagram to show you what it is and where it is, hope this helps.3e85522.gif

Posted on Jan 27, 2010

csmock132
  • 4669 Answers

SOURCE: the front wheels won't engage when I shift down to

The system is electric and it sounds like the actuator on the front axle is bad.

Posted on Dec 11, 2010

Molson02536
  • 3854 Answers

SOURCE: 1993 K1500 4 wheel drive not engaging. What 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.

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 whining or grinding noise you hear.

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

Posted on Feb 23, 2010

Testimonial: "Mr. Molson, sorry this Thank You is way overdue, I have checked / replaced the actuator & it does work. Thks. 4 the part #'s too!"

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4wd silverado 2500 hd


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.

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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)
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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.

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08 f150 4x4 on front end only one side is disengaging when in 2 wheel drive. The problem is when engaged into 4x4 wheel drive the front drive line spins and both sides engage but only the back wheels spin...


If I read this correctly ( which I might not have, bit early for me ), the front drive shaft will engage ( from the transfer case ) but the front wheels are not engaged ?

If so, sounds like either the vacuum from the IWE ( Integrated Wheel End ) is not being released, or the IWEs have had an issue with part vacuum ( damage vacuum lines ) and the IWE gear is rounded off.

If you pull the vacuum lines at the IWEs ( there are 2 lines, 1 is the vacuum line, the other is the vent tube that routes up into the engine compartment and is not attached to anything ), the front wheel should engage ( might need a 5 * turn to mesh the gears ). With the vacuum lines off, jack up the front axle ( take precautions, chock the rear wheels, parking brake, jack stands, etc ) see if the front wheels are engaged ( turning one wheel should turn the other ). The option is to do this after the truck has sat over night, and the vacuum has been released out of the vacuum reservoir.

If the wheels turn correctly ( engaged ) I would think the contact plates in the transfer case are not making contact. Good starting point for this is the connector on the side of the transfer case, some times this gets gummed up, and the pins do not make good contact. The contact plates in the transfer case are used for a few things, one of them is to signal the IWE solenoids to release vacuum to the IWEs.

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vacuum is removed the spring engages the IWE.

Here is a black diagram of the IWE vacuum system
sscullys_108.jpg

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I have a 2000 z 71 all leds work replaced frt axel motor and wtched it work while out it goes in low range but still in 2 wheel drive like the frt end wont engage is there any thing eles i can look at ...


Check the transfer case. Put a jack under the rear axle and jack up the rear wheels. Have a helper put in 4 wheel and the trans in drive. Have him/her ease off the brake and see if the rear wheels spin. If they spin, 4x4 isn't working. If the truck tries to pull forward with the rear wheels up then it works. Now, if the rear wheels are spinning carefully look under the truck and see if the front driveshaft is spinning along with the rear driveshaft. If the front shaft is spinning then it is an axle problem. If the front shaft is not spinning then it is a transfer case problem. GM has a problem with the NP263 case.

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1 Answer

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.

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1 Answer

I have a 1997 5.7 Liter Cheverolet Z71. The 4 wheel drive is not engaging. I can hear the trasfer case engage and can even hear the difference in the transmission when in 4 Lo/hi when driving. However...


Having 4 wheel drive is not actually the case unless you have limited slip on both axles. Do you know if one wheel will spin on both axles. If you can't get either wheel to spin on the front axle and one will spin on the rear then I would agree your not getting front wheel drive. Since you can tell a difference between hi/lo the transfer case is definitely engaging

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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
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