Question about 2003 GMC Sierra 2500HD

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I think it is the transfer case on my 2004 GMC 2500HD 6.0L truck that is gone. It seems like when you load up the 4 wheel drive or turn sharp the chain binds up and snaps and gives a jolt. Just wondering what the part numbers are needed to change this out. I am sure it is the problem. the oil was right black in there as well. Both CV axl's have already been changed out.

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Call local dealer give them info they will give you the parts needed.

Posted on Dec 13, 2009


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1 Answer

What is the most common problem with 4 wheel drive on gmc canyon when it will not engage

It is activated by an electric Solenoid. Try jumping straight 12 volts to it and listen to see if it clicks. If not replace it.

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Safari Transfer Case

You can add what is called "Limited slip additive" to your transfer case. Available at all GM Dealers, and most part stores. You are a good driver to feel and hear this symptom...Hope this helps.

Apr 26, 2012 | 1999 GMC Safari

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My 2007 2500HD Duramax 4 wheel drive Hi or Lo doesn't engage. The "Service 4 wheel drive" light comes on. No noises when trying to engage. Replaced the actuator, but no difference. Also sometimes when

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DTC B0775
DTC B0780
DTC B0785
DTC B0790
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Which transfer case does it have ?
Transfer Case - BW 4485-NR3
Transfer Case - MP 1222/1225/1226-NQG
Transfer Case - MP 1625/1626-NQF
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Sep 02, 2017 | Cars & Trucks

1 Answer

Encoder motor for the 4 wheel drive where is it

Hi, Its located under the transfer case. The long black plastic cylinder.

Aug 23, 2010 | 2003 GMC Sierra 2500HD

1 Answer

Sounds like it's in 4-wheel drive

You may have a bad TCC (Transfer Case Controller) or the Transfer Case actuator is bad. This repair will need to be done by a mechanic familiar with 4x4 systems.

May 19, 2010 | 2004 GMC Envoy

1 Answer

I have a 2007 gmc 2500HD. The service four wheel drive light is on and the four wheel drive will not engage. What could it be

check the shift solenoid on the tranfer case also check the voltage going to it! make sure theres 12 volts and check the ground also check the fluid level in the transfer case

Jan 19, 2010 | 2004 GMC Sierra

1 Answer

I am trying to replace the 4wd drive actuator on my 2004 do i get the spline on the transfer case to line up with the spline on the actuator?

Rotate the actuator until the spline goes on partially, then rotate to align with mounting bolts. May need to turn wheels while doing the final rotation.

Jan 15, 2010 | 2005 GMC Sierra 2500HD 4WD

1 Answer

My 2500hd s 4 wheel drive service warning is

The  actuator on the front diff or transfer case is stuck or bad. This will send a signal back and turn on the service light. In 2003 I believe the actuator is on the front differential.  

Oct 24, 2009 | 2003 GMC Sierra 1500

1 Answer

Instrument cluster says " Service 4 Wheel Drive". No 4 wheel drive while this is on.

Two possibilites:
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are you still under warranty??

Jun 03, 2009 | 2003 GMC Sierra 2500HD

1 Answer

GMC Sierra 4 wheel drive won't disengage

i had the same issue change push button cluster

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