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2003 hummer h2 4x4 service light comes on and i just service front and rear ,transmission and transfer case.

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Posted on Jan 02, 2017

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SOURCE: hummer h2 transfer case

Only way for this to happen on an H2 (AWD) is for something to break rearward of the lockup hub. Take a look at the splines between the intermediate shaft and centerdifferential or even the teeth on the forward sun gear and/or stepped pinion on the center diff.

As long as you have the t-case torn down for repair be sure to upgrade to the new aluminum mode fork (production upgrade to old plastic forks thru end of 2007 or so). You should also upgrade the rear half of the housing to the 2008 version which has a pressed-in rear prop bushing (better bushing and is also replaceable.

Posted on Sep 30, 2008

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SOURCE: rear output shaft seal on transfer case

How to remove axle shaft seal on hummer H2

Posted on Dec 13, 2009

  • 170 Answers

SOURCE: need diagram to change fluids in transfer case and

This is pretty straight forward once you have a few basic tools. You will need a suction pump and a bowl/bucket type container to put the old fluids into.

Both the front and rear diffs should have a rubber inspection plug you can remove to pump the old stuff out, and the new gear oil in.
Synthetic fluids last longer and work better.

The transfer case should have two threaded allen plugs (or similar) that are removed to drain and then refill the T case. Remove bottom then top to drain. Reinstall bottom then refill.Then reinstall top.

Posted on Aug 10, 2010

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1 Answer

How to replace the bearing the front drive line yoke goes into the transfer case on a 2003 h2 hummer


Very easy, release the axle nut, remove the brake caliper, remove the rotor, disconnect the cable from the abs sensor, on the inner side remove the three screws and drop the yoke on your hand

May 25, 2017 | Hummer Cars & Trucks

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2005 h2 hummer getting messages to service 4 wheel drive now at about 25-30 mph getting a vibration


First check the drive shafts(vibration). Universal joints could be bad. Best to have it off the ground. No pressure from the tires and transfer case/transmission. Service 4x4 has to go on a scanner to get codes. Check fuses first.

Dec 15, 2016 | 2005 Hummer H2

1 Answer

2001 chevy blazer transfer case removal


How to Remove a Chevy Blazer Rear Transfer Case The transfer case on a Chevrolet Blazer is underneath the vehicle, mounted to the rear of the transmission. On four-wheel drive vehicles, the transfer case takes power generated by the engine and channeled through the transmission and directs it to the front and rear drive axles. Over time, the gears and bearings inside the transfer case can wear and the transfer case must be rebuilt. The transfer case on this vehicle must be removed before it can be serviced.
Things You'll Need
  • Wrench set
  • Floor jack
  • Jack stands
  • Socket set
  • Masking tape
  • Marker
  • Needle-nose pliers
Hide Instructions
  1. Removing the Driveshafts
    • 1 Disconnect the ground cable from the negative battery terminal, by using a wrench to loosen the retaining bolt and pulling the clamp off the terminal.
  • 2 Raise the vehicle and support with jack stands placed underneath the frame.
  • 3 Drain the transfer case. Locate the drain plug near the bottom of the transfer case. Place a waste oil collection pan underneath the plug and use a socket to remove it. Once all the fluid has drained out, reinstall the plug.
  • 4 Remove the bolts that connect the rear driveshaft to the rear axle yoke using a socket. Lower the driveshaft, and slide it backward underneath the rear axle to disengage it from the transfer case. Remove it from the vehicle.
  • 5 Remove the bolts that connect the front driveshaft to the front axle yoke using a socket. Lower the driveshaft, and slide it forward underneath the front axle to disengage it from the transfer case. Remove the driveshaft from the vehicle.
  • Removing the Transfer Case
    • 6 Label and disconnect the electrical wires and vacuum lines connected to the transfer case. Use masking tape and a marker.
    • 7 Remove the transfer case shifter rod. Using needle-nose pliers, remove the clip that connects the shifter rod to the transfer case. Slide the rod away from the transfer case.
    • 8 Position a floor jack underneath the transfer case. Raise it enough to take the weight of the transfer case off the transmission.
    • 9 Remove the bolts that connect the transfer case to the transmission using a socket or wrench.
    • 10 Slide the transfer case rearward to disengage it from the transfer case. Lower the floor jack, and remove the transfer case from the vehicle

    Jul 27, 2014 | Cars & Trucks

    1 Answer

    2003 h2 hummer is having shifting problems with transfercase. and the shifter moves freely even if the truck is off with out using break pedal


    I had this problem with my 3002 H2, it was the transfer case. The OEM Transfer case has a plastic shifting fork. this wears out and eventually will cause the transmission to go out, I purchased a re-built transfer case on-line of $700.00 and had it installed for $500.00. problem solved....and the re-built has no plastic shifting forks.

    Mar 27, 2013 | 2003 Hummer H2

    1 Answer

    I have a 2003 gmc envoy the service 4wd light came on and 4wd didnt engage what do you think the the problem is


    Possible the actuator on the front axle is bad! You need to see if the front drive shaft is rotating when the 4HI is engaged with out running yourselft over in the process.

    There is one actuator on the axle and one on the transfer case, the one on the trnsfer case locks the drive shaft in ans out of 4HI and 4LO. The actuator on the frontaxle locsk the front drive shaft in
    .

    Also, try the wires going to the front actuator, they seem to break very easy and short, also the front Actuator, check it.
    1. Raise and support the truck on jackstands.
    2. Drain the transfer case.
    3. Disconnect the speedometer cable.
    4. On models equipped with the NP208 transfer case, place the case in the 4H position.
    5. Remove the skid plate and if necessary, the crossmember support.
    6. If necessary, on trucks with automatic transmission, disconnect the strut rod.
    7. Tag and unplug all electrical connections and hoses from the transfer case.
    8. On models equipped with the NP208 transfer case, remove the parking brake cable guide from the pivot on the right frame rail.
    9. Matchmark the driveshafts, disconnect them, and remove them.
    10. Disconnect the shift lever rod.
    11. Support the transfer case and remove the bolts attaching the transfer case to transmission adapter.
    12. Move the transfer case to the rear until the input shaft clears the adapter and lower the transfer case from the truck.

    Sounds as though you a have a problem with the switch itself, although it could be the encoder on the transfer case , me--- I would have it checked at a transmision shop where they have a computer to check it. Every time you unhook a wire on the truck , you should have the + cable off the battery, cause this puts another code into your main computer.

    Keep us uopdated.

    Dec 22, 2010 | 2003 GMC Envoy

    1 Answer

    My "service 4wd" came on and my push button 2wd,4wd, auto 4wd lights are off...is this expensive to fix?


    You definitely need to have it serviced & checked out...The service 4WD indicator read across my screen, but I did not have serviced...Eventually, I heard a grinding noise & because I didn't have it serviced when I took it in, it was found that the transfer case had no tranfer case fluid at all...This damaged the transfer case which had to be replaced (used transfer case-$400.00)....The transfer case is part of your transmission...The shape mine was in could have broke my transmission...Have it taken care off before it gets too bad...You must use only GMC Transfer Case Fluid

    Oct 21, 2010 | 2003 Chevrolet Tahoe

    2 Answers

    Am looking for a repair maual for a 2003 Hummer H2 that has an electrical diagram in it?


    Go to faxonautoliterature. They carry the original dealer service manual for your Hummer. It will havwe wiring diagrams in it. I have used them before and had excellent service. Hope this helps.

    Nov 29, 2009 | 2003 Hummer H2

    1 Answer

    Part-time 4wheel drive


    you have a bad or faulty sensor that communicates the 4wd position to the dash the sensor is on the top front of the transfer case. Find a large open area and drive in reverse for about 500 feet then put car in drive and pull forward this might enable the sensor to know what position the transfer case is in The transfer case is connected to the transmission and also to the front and rear axles by means of drive shafts. If this doesn't work change you sensor on the top front of your transfer case. hope this helps you please rate me and for further assistance you can always ask me. wutxtye0rjd9d9ekmodqt1eoxkvn9hr9qjz1l3dabggyud7sdgr36czsrfxqenadhnijx9nfayi+sz1sug0aaaaasuvork5cyii=

    Apr 10, 2009 | 2003 Jeep Liberty

    1 Answer

    Hummer h2 transfer case


    Only way for this to happen on an H2 (AWD) is for something to break rearward of the lockup hub. Take a look at the splines between the intermediate shaft and centerdifferential or even the teeth on the forward sun gear and/or stepped pinion on the center diff.

    As long as you have the t-case torn down for repair be sure to upgrade to the new aluminum mode fork (production upgrade to old plastic forks thru end of 2007 or so). You should also upgrade the rear half of the housing to the 2008 version which has a pressed-in rear prop bushing (better bushing and is also replaceable.

    Aug 05, 2008 | 2004 Hummer H2

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