Can you install a 2 speed transfer case in to a vehicle with a single speed?

Discussion in 'Engine & Drivetrain' started by Tozan, Jul 25, 2017.

  1. swathdiver

    swathdiver Full Access Member

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    First I've heard of this. Are you saying GM switched to something other than the Magna Power MP3023/3024 2-speed transfer cases?
     
  2. NotBabb

    NotBabb TYF Newbie

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    That's the information I've found. My neighbor has a 2007 avalanche with the 2 speed transfer case and it's nothing like the newer one in my truck.
     
  3. swathdiver

    swathdiver Full Access Member

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    So did you have an MP3010 originally? What do you have now?
     
  4. Tozan

    Tozan Overlander

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    Wow thanks a lot that is great news, I was hoping it would not be a real big deal. Now to start looking for parts.
     
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  5. NotBabb

    NotBabb TYF Newbie

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    Yes I had the MP3010 originally and I replaced it with a MP3023.

    I think I got confused when you asked if gm used something other than the mp2023/2024.

    From what I've seen, 2010 is when they changed to using magnapower transfer cases which is also when they changed to the 6l80.

    I thought they were still using the NV cases in 2007-2009.
     
  6. swathdiver

    swathdiver Full Access Member

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    Go back one more year to 2009. See my signature? GMT900 Yukon Denalis always used the 6L80 and the 2500s switched over to the 6L90/MP3024 in 2008.

    Only thing I cannot presently remember is which t-case I have, the MP3023 or MP3024. Probably the former, will have to check next oil change.
     
  7. NotBabb

    NotBabb TYF Newbie

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    Ah ok, I'm far from an expert at what parts came in what. I am an expert at breaking rearends and transmissions though. Lol

    First rearend was installed wrong and cooked the bearings. Second rearend lasted a year until the G80 grenaded and also took out second gear in the transmission. Third rearend went through 2 sets of spider gears in 2 months until Yukon ponied up the cash to just have a Detroit tru-trac locker installed and I haven't had any problems since.
     
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  8. Tozan

    Tozan Overlander

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    Today I installed the following for the upgrade. All used parts were from the same vehicle a 2011 Tahoe 50K miles with the optional 2-speed transfer case.

    Parts:
    Two speed transfer case
    Electric Transfer shifter
    Transmission control unit
    Control switch in dash
    2 quarts of Auto trak II oil

    The job took a casual 3 hours to install and test. Since I have a lifted Tahoe we didn't need to jack it up.

    Removed:
    Both drive shafts
    Cross member, wiring and the vent line.

    Then dropped the transfer case cleaned off the old gaskets and replaced the rear out put seal since it was off another vehicle. Then installed the used transfer case and put the rest of it back together.

    Pried out the plastic piece holding the shift control knob pushed on the retaining tabs and installed the new control button. Then popped it back in Be sure to keep the plastic piece square when you reinstall it so it will pop right in.

    Remove the kick panel under the steering wheel by removing 2 screws and one bolt.With the panel removed you will be able to look about 6 inches back and see the Transmission control unit. There are three plugs remove all of them and hit the tabs on the top and bottom to release the TCU then reinstall the unit.

    That's it no reprogramming, changing wiring harnesses or anything like that it is a simple plug and play upgrade...
     
    Last edited: Jul 11, 2019 at 9:30 PM
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  9. Tozan

    Tozan Overlander

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    Went out and road tested it and everything is working fine...

    Total cost on this was around $450.00
    And Three hours.
     
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  10. swathdiver

    swathdiver Full Access Member

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    Swap that out for Dexron VI Charles. The MagnaPower transfer cases use transmission fluid.

    Glad this swap is plug and play without any programming required.
     
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