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  1. #1
    Sr. Apprentice browenb's Avatar
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    Apr 2008
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    Saint John, New Brunswick, Canada
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    Default Service 4WD - What are the two part numbers?

    So, my '04 Silverado, Z71, 4.8, extcab, that I have just rolled 306000 Kms (190.139.6 Miles) on has Finally given me the 'Service 4WD' on the dash.

    I've read through the other posts, and spoke to my local dealer. Dealer wants $120 to plug in my truck and tell me if it is the push button in the dash of the actuator on the transfer case.

    I'm thinking, if the parts to replace them both come to the cost of one part plus the diagnostic charge, why not just buy both parts and be done with it?

    Problem is, I can't seem to find the Delco part numbers for either the push button assembly, or the actuator for my truck.

    Anyone willing (and I know someone always is) to lend me a hand as to how to come about getting these part numbers?

    Many thanks.
    '04 Silverado Z71 Special Edition
    '81 Camaro - 400 SBC - 30 Over - th350 w/Stage II shifter - 4.10's
    '70.5 Camaro - Bone Stock

    '75 Porsche 914
    '27 Model T

  2. #2

    Default

    Well, there is a third part, it is called the TCCM (transfer case control module), usually mounted under the dash.

    The switch usually does not throw the serve 4WD light, the TCCM and the encoder motor (in transfer case) will.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3
    Sr. Apprentice browenb's Avatar
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    Apr 2008
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    Saint John, New Brunswick, Canada
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    Default

    Damn, ok, so I'm back to hauling it into the dealer and a $120 bill just to find out which component it is then...

    Thanks for the heads up RayVoy, maybe it's time to transplant this 8.1, trans, and tcase... and do away with the electronic t-case all together...
    '04 Silverado Z71 Special Edition
    '81 Camaro - 400 SBC - 30 Over - th350 w/Stage II shifter - 4.10's
    '70.5 Camaro - Bone Stock

    '75 Porsche 914
    '27 Model T

  4. #4

    Default

    Ya know, just a thought... try changing the t-case fluid.

    Maybe it's just dirt/friction causing the problem
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  5. #5
    Sr. Apprentice browenb's Avatar
    Join Date
    Apr 2008
    Location
    Saint John, New Brunswick, Canada
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    Default

    You think that might throw a code? I am due to change all the fluids again in about 30,000 Kms.

    In all honesty, I can't complain about the truck, most of these up here on the East Coast of Canada are already gone. (rust) I put a DiamondKote Module on this when I bought it, and I think other than regular oil changes to the 4.8, and all fluids every 100,000Kms, and a wheel bearing assembly every now and then, it's been very dependable.

    Because of the DiamondKote Warranty (I'm keeping them to there word of 'As long as I own the vehicle') I don't want to look at getting a newer truck, I've done enough upgrades to this that it is pretty much a 2500 now as it stands. Would hate to start all over again. ;) As long as the Frame and body stay sound, which they should as long as that DiamondKote system stays running, I'll swap engines when they give out and continue on with this one until it is too far gone.

    Anyone ever swap a manual transfer case for one of these electric ones? Any big issues with doing this? I've got on on the tail end of the 8.1 and trans.

    Thanks again to anyone with ideas. And thank you RayVoy for the advise.
    '04 Silverado Z71 Special Edition
    '81 Camaro - 400 SBC - 30 Over - th350 w/Stage II shifter - 4.10's
    '70.5 Camaro - Bone Stock

    '75 Porsche 914
    '27 Model T

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