Question about 2001 GMC Sierra 2500HD

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Transfer Case Binding Up

When engaged in 4Hi the transfer case will bind and lock up the front wheels. Have to back up to unlock it and go again and locks up. Works and drives fine in 2Hi.

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  • bigharvo_75 Jan 22, 2009

    k thanks i will check into it

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  • Master
  • 1,990 Answers

You have a Bad Gear in the Transfer Case. This will require a Rebuild to fix.

Posted on Jan 22, 2009

  • Travis Humphries
    Travis Humphries Jan 22, 2009

    No Problem! Happy to Help!

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1 Answer

When I select 4 wheel drive, why does it feel as though it is binding or dragging and whining while driving?


Depending on the specific vehicle many 4WD have a transfer case that will lock the front and rear drives shafts together. This configuration is only for slippery conditions like ice and snow or very wet or off road. When turning the radius is different between the front and rear so there is a lot of feedback to the steering wheel. This is created by the fact the front set of wheels and the rear set of wheels must make the same number of turns because of the locked transfer case.

If you attempt to drive on high friction surfaces the stress to the drive train is excessive and will cause damage. The whine and the bunny hop is the drive train attempting to release this tension. If you were on a slippery surface the tires would have much less resistance turning at slightly different rates.

Also critical is the tire size need to be the same. However even with perfectly matched tires the problem on dry surfaces remain the same.

The AWD vehicles are equipped with a third differential that allows for the difference between the rotation of the drive shafts so it can drive on dry pavement no problem. Some configurations allow the AWD to have the transfer case locked which falls into the first category where dry pavement is prohibited.

Some Jeeps have a viscous coupling in the transfer case that permits limited slip between front to rear but the resistance to slip increases as the deference increases as in the event one tire is slipping
These Jeeps still have the lock up option in the transfer case requiring dry pavement when engaged.

Hope this helps?
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Jan 17, 2016 | Cars & Trucks

1 Answer

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

1 Answer

1995 GMC Sonoma will not switch back out of 4 high?


Are the front hubs still locked in?

If you have manually locking front hubs, you probably have a bit of binding in the drive train due to the front wheels being locked to the drive system

After unlocking the hubs, back up about 20 feet, then back forward about 20 feet.....see then if the transfer case can then be disengaged. You MAY need to just yank on the transfer case shifter while the vehicle is moving (slowly of course).....

I had an older ford pickup which did the same thing.....disengaging the hubs and just yanking the shifter had disengaged the 4 wheel drive then I was able to put it back into 2wh high.

Feb 28, 2011 | 1995 GMC Sonoma

2 Answers

Front axle does not engage. Push 4hi or 4lo button, transfer case motor engages front drive shaft, front diferential actuator extends, but no 4 wheel drive. What do I check next?


There may be vacuum lines running down to the hubs. If so check them for vacuum when engaging and dis-engaging 4 wheel. If you can't feel any vacuum, trace lines, and check for leaks.

Dec 13, 2010 | 2002 Chevrolet Silverado 1500HD

2 Answers

Bad grinding noise that actually binds up the vehicle so it won't go. Sound like brakes but have already replaced brakes, wheel bearings, front axle arms, new tires, and checked the gear, the awd light,...


The problem is likely the transfer case has locked up, the question is do you need it to continue to be an AWD vehicle? If not a simple solution is to remove the driveshaft from the transfer case to the front differential case. Takes maybe 15-20 minutes and there are no leakage issues by doing so. The vehicle will now be a rear-wheel only drive one. I recently did this to our own 2003 model and as the car stays in the south, there is no need for the AWD. The car performs as expected and that binding problem is gone.

Apr 19, 2010 | 2002 Mercury Mountaineer

1 Answer

The front wheels on my 2000 gmc jimmy will not lock in 4hi or 4lo


In addition to transfer case engagement via an actuator on the "T" case there is a front axle actuator. On my Blazer which I'd bet is very similar.. There was a vacuum diaphragm under the battery which operated a cable to "lock in" front axle. make sure you have vacuum supply when asking for 4 wheel operation and make sure cable is not seized. If this checks out o.k. back to transfer case. your question asked about front wheels locking so I assumed your "T"case was working

Feb 19, 2010 | 2000 GMC Jimmy

1 Answer

My front transfer case on my 1997 Ram 1500 is


If you've been 4X4 driving a lot it could be that your gears are binding up . Meaning . . if you've ever had your vehicle locked in 4 and decided to hit pavement without unlocking, ( even if it was only a short distance, ie: a block or to), your gears have a bind on them which in time will really cause major problems. Starting with being hard to get into and out of 4WD and grinding noises. there are a few other things it could be instead but starting with this no cost attempt to finding out, I suggest you try it. You might be suprised. Put the truck in neutral . Jack up the front and rear of the truck and secure withjack stands. the wheels should give up what bind there is at that point.

Dec 20, 2009 | 1997 Dodge Ram 1500 Club Cab

1 Answer

The transfer case will not engage four wheel drive in my 97 ford supercab f250


Here are a couple of solution you may try:

(1)-Transfer case not fully engaged. Stop the vehicle, shift into neutral and then engage into 4wd.
(2)-shift linkage loose, worn or binding. Tighten or repair or lubricate linkage as nessary.
(3)-Shift fork cracked, inserts worn or fork binding on the rail. Disassemble and repair as necessary.

Hope this will help

Jul 12, 2009 | 1997 Ford F250 SuperCab

1 Answer

4x4 transimission clunks when engaged?


When engaging the 4WD system, you are pulling the lever on the Transfer Case right? Not the transmission, it's a different gearbox.
There were several versions of transfer cases that used both full and part-time 4 wheel drive.
From your description this sounds like a part-time transfer case.
Going with that, it is somewhat normal to hear and feel a mild clunk when engaging 4WD high range, especially if you are at a complete stand-still or under full throttle.
Try engaging 4WD High while slowly rolling at idle - no throttle. It should pull in fairly smoothly.
Once 4WD is engaged it will literally LOCK the front and rear axles together. So do not do it on hard dry pavement.
These older style 4WD systems need a little "give" especially when turning. The engineers assume you are not engaging 4WD unless you are in a somewhat slippery scenario.
Many CV joints, axles, U-Joints, differentials, and transfer cases are damaged and broken by folks who don't understand this.
Reading the owners manual should provide a clearer description of what you've got.
Bear in mind that when you come out of 4WD it may not completely release, again due to hard pavement binding up the axles. You can try this: backing up 10-25 feet in a straight line, or getting one set of wheels on the shoulder or in some gravel. That should allow it to release the transfer case and go back to everyday 2WD high.
I hope this helps.
:)

May 14, 2009 | 1996 Jeep Grand Cherokee

1 Answer

Will not switch between four wheel drive and two wheel drive.


DID YOU CHECK THE MOTOR IN THE FRONT AXLE AS WELL AS THE ONE IN THE TRANSFER CASE GOOD LUCK

Dec 31, 2008 | 1994 Chevrolet S-10 Blazer

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