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My duramax grinds into gear when shifting to four high on the fly

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Have you replaced any tires lately if tire size is off a little this will happen i dont mean two different sizes if you have new tires on front and worn tires on rear or vise versa on large tires it dont much to change diff ratio so front and rear wont match

Posted on Nov 03, 2010

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2002 ford ranger - Where is the 4x4 actuator located


On the transfer case
Transfer Case - Electronic Shift
The four-wheel drive electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4WD HIGH, and 4WD LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators: one for 4WD HIGH which appears as 4WD, and one for 4WD LOW, which appears as 4WD LOW. Shifts into 4WD HIGH can be made at any speed. When shifting into 4WD HIGH with the vehicle stationary, tooth blockage may occur preventing shift completion. When the vehicle is driven above 8 km/h (5 mph) the shift will complete. When shifting in or out of 4WD LOW, the four-wheel drive (4WD) control module requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission be in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission).
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and range fork within the transfer case between the 4WD HIGH, 4WD LOW, and 2WD range positions.
The four-wheel drive (4WD) control module controls the gearmotor encoder assembly that shifts between 4WD HIGH, 4WD LOW, and 2WD modes.

Mar 17, 2017 | Ford Cars & Trucks

1 Answer

4x4 shifting


Shift on the fly is a term used by manufactures to show that you do not have to be stopped to change ratios or gears . All the gears are syncro controlled so stopping is not necessary ( a real bummer if you are half way into a bog to stop and select low range 4 wd) . Shifting on the fly will cause wear on the syncro dog teeth as the dog will not properly engage and so a tapered wear pattern occurs that will eventually lead to jumping out of drive or gear.. You can learn to lift the foot momentarily while making the change and this breaks the load on the teeth long enough for the dogs to engage properly then reapply the power. Good drivers read the road ahead and select the correct combination before entering the area so shifting on the fly is done with no problems for the transmission and it is normally done at low speeds not full on fast

Dec 12, 2013 | 1998 Ford F150 Regular Cab

1 Answer

1996 dodge ram 5.2 auto 318 to shift to 4wd do u put in park or drive and can you shift to and from 4wd on the fly


Need to know what transfer case it has. Most t-cases have synchronized gearing...meaning shift on the fly. A quick test is drive at less than 5 mph, and shift, no gear clash means you have synchros. ****This is only from 2wd to 4 high. 4 low you MUST be stopped(doesn't matter what gear its in).****

Sep 14, 2013 | 1996 Dodge Ram

1 Answer

I have an 2004 chevy blazer 4x4 and the four wheel drive does not engage on the fly and it also will not engage when in neutral. Four wheel low will work but when you press 4 wheel hi it blinks twice and...


Which of these does your vehicle have ?
The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel.
The NVG 236 transfer case features a 4 button shift control switch located on the instrument panel.
Do you know what DTC'S - diagnostic trouble codes are ? Both of these 4X4 systems can set DTC'S , Having a professional or factory scanner is what is needed to check for these codes . Not a OBD 2 code reader or autozone , advance etc... The four button system can set a bunch of them .
DTC B2725
DTC C0300
DTC C0305
DTC C0308
DTC C0309
DTC C0310
DTC C0315
DTC C0323
DTC C0324
DTC C0327
DTC C0362
DTC C0367
DTC C0374
DTC C0376
DTC C0387
DTC C0550
DTC C0611

The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch, to determine if a new mode/gear position has been selected. At a single press of the transfer case shift control switch, the lamp of the new position begins flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been reached, or has engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position remains ON constantly.
The NVG 233 transfer case provides the driver with 3 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
Any of these mode/gear positions may be selected while driving the vehicle. However, the transfer case will not allow a shift into, or out of, 4LO unless the following criteria has been met:
• The engine is running.
• The automatic transmission is in Neutral, or the clutch pedal is applied on manual transmissions.
• The vehicle speed is below 5 km/h (3 mph).


Finding out what if any codes are stored should be your first step .

Feb 22, 2018 | 2001 Chevrolet Blazer

1 Answer

1995 jeep grand cherokee grinds when shifting into full time four wheel drive. What gear should the transmission be in when shifting four wheel drive?


Try neutral. or in drive, but just crawling. Give light pressure to the stick and sort of let it just fall into 4x4

Jan 08, 2011 | 1995 Jeep Grand Cherokee

1 Answer

How to shift a 1998 jeep grand cherokee into 4 wheel drive


Four low is almost never used. I use it on very steep rocky or muddy trails in the woods or to pull someone out of mud or a ditch. Though some will shift standing still it is best do do this while rolling. Four high can be shifted at low speeds of 2 to about 35mph (higher also but not really good idea) Low can only be shifted between 2 to 10mph. If you find yourself stuck and unable to shift because you aren't rolling you can also turn the engine off, engage the transfer case and re-start. That avoids having the gears clashing together. Best rule is if it begins to grind, don't force it.

Jan 31, 2010 | 1998 Jeep Grand Cherokee

1 Answer

1996 Dodge Ram 1500 standard V8 4x4 - Difficult engaging or shifting into 4-wheel drive, some grinding when trying to shift 4-wheel gear shift?


!996 that's pretty old school, I don't think that has a shift on the fly feature. Maybe once the hubs are locked in.

Dec 23, 2009 | 1996 Dodge Ram

5 Answers

2003 gmc sierra duramax 2500


Problem with Diesel Fuel System. Gmc 2002 duramax 2500 HD 4x4 will start 

Apr 19, 2009 | 2003 GMC Sierra

1 Answer

1993 4X4 BLASER 4WHEEL DRIVE


Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!

Dec 31, 2008 | 1994 Chevrolet S-10 Blazer

3 Answers

Can,t get truck out of 4x4 low range


try putting your truck in neutral and then shifting into 2 wheel drive shift on the fly does not apply to 4 low only 4 high and on electric shift models it wont shift unless your ****** is in neutral.

Aug 26, 2008 | 1999 Ford F250 Regular Cab

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