Question about 1991 Chevrolet K1500

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Why will my front diff not disengage,transfer case will come out of high and low range. floor light gets even brighter when its back in two wheel drive.

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  • 228 Answers

The electric actuator at the front differintial is not retracting the shifting fork. Common failure

Posted on Sep 10, 2010

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4 wheel drive won't engage


Which do you have ?
Transfer Case - NVG 236 (Two Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
Is the switch light on or flashing ? If you have automatic 4x4 there are several DTC'S that can set >
DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0362 4LO Discrete Output Circuit High DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error

Dec 01, 2015 | 2000 Chevrolet S-10

3 Answers

99 Ford F-150 won't go into 4wheel drive I looked undernieth and front drive shaft is not turning


Someone will have to go under and check the linkage is working when the 4 wheel drive is fully engaged and not just moved to a neutral position.

Dec 04, 2014 | Ford Cars & Trucks

1 Answer

I have 2003 RA Holden Rodeo 3.0 ltr T/Diesel. The 2 front wheels don't seem to be engaging when i put it into 4wd (high or low range). I can hear the high and low range click in when i press the buttons...


Does yours have AUTO hubs, there are some luxory models have auto hubs, these rely on difference in drive on the axles,(wheel spin) others have manual locking hubs, these actually need to be engaged manually, these require you to twist the centre of the hub to engage and disengage the front hubs, these sometimes require you to reverse to disengage properly, Rodeo had both depending on model. Happy New Year

Dec 30, 2013 | Isuzu Rodeo Cars & Trucks

1 Answer

I got my 2002 chevy blazer with ZR2 package into deep water and shorted out my 4 wheel drive control module (located under the kick plate on the passenger side). I took the module out and had it replaced...


what sounds like is happening is the front end is not disengaging, it will not hurt it to drive without the module, but you need to find out why the front diff. actuator is not releasing. their is a shift motor on the transfer case, module and switch in the cab, and actuator on the front diff. all are susceptable to water, I would suggest getting a manual on it to aid in diagnostics

Oct 13, 2010 | 2002 Chevrolet Blazer

1 Answer

4 wheel drive will not engage (1995 S10 Blazer)


I had this same problem a few years ago. In my case I didn't use the 4 Wheel Drive very often and the tranfer would hang in 2 Wheel. I fixed mine by tapping on the transfer case with a hammer while my wife switched back and forth from 2 Wheel to 4 Wheel.

Jun 14, 2009 | 1994 Chevrolet S-10

1 Answer

Four wheel won't engage


Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

Dec 29, 2008 | 1991 GMC C1500

3 Answers

My transfer case goes into gear but doesn't turn the wheels.


The lights can come on wihtout the transfer case really working..the lights are actvated by a simple switch and only indicate the switch has been depressed.

It's sounds as if you have a problem with the lickage, or maybe damage inside the transfer case itslef

Dec 20, 2008 | 2003 Ford F150 Regular Cab

1 Answer

1990 Suzuki Escudo 4 wheel drive


As far as I know the procedure should go something like this...

Stop the vehicle, engage the parking brake and if applicable, get out and turn the hubs on the front wheels from Free, to Lock.(You may not have these on a Suzuki, they may be auto-lockers)

Get back in the vehicle and put the transmission shift selector into Neutral.

If you have a manual transfer case, move the selector-shaft to 4x4-High, or 4x4-Low -- whichever is desired. Now, putting the vehicle in gear with the transfer case is sometimes somewhat difficult. As long as the vehicle's transmission is in neutral, don't worry, the gears inside the transfer case are big and beefy -- Don't be afraid to be rough -- Again as long as the transmission is in neutral. You may also have to disengage the parking brake and slightly let the vehicle roll forward or back with your foot-brake to get the Transfer case to lock into place.

Once 4x4 of the selected High, Or Low range is selected, usually indicated by the vehicle jerking slightly with a slightly loud clank/thud. Move the Transmission selector out of neutral into your desired gear (Drive if Automatic, if Manual, whichever gear you pull out from). and voila! You should now be in 4-Wheel-Drive.

To disengage 4-Wheel-Drive. Just reverse the steps.

May 16, 2008 | 1990 Suzuki Sidekick

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