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

[Fless]

Isn't the "Transmission Control Unit" really the transfer case module?

 

[Tozan]

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.

Thanks I will do that is it going to hurt it if I put a 100 miles on it. before changing it?

 

[swathdiver]

Thanks I will do that is it going to hurt it if I put a 100 miles on it. before changing it?

Not sure exactly but I would think as long as you do not engage the front axle it should be ok until you get it swapped out.

 

[Tozan]

Well that is to late... lol I went 4 wheeling with it yesterday.

Not sure exactly but I would think as long as you do not engage the front axle it should be ok until you get it swapped out.

 

[Tozan]

I changed it out today and to be safe I can change it again in a few weeks if it is needed.

 

[Brad Sponsel]

Isn't the "Transmission Control Unit" really the transfer case module?

I have the same question, is it the same?

 

[Brad Sponsel]

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...

HI, I know this is an old thread but I'm looking to do the same thing. I have a 2012 Avalanche LS that does NOT have 4LO.. So am I looking for the MP3023 transfer case? (From what I'm reading the 3024 is for the 2500, and the 3023 is for the 1500, correct?)
Also, just to verify, I'm not losing any functionality by doing this, such as stabilitrac or limiting the AWD function, am I?

 

[swathdiver]

HI, I know this is an old thread but I'm looking to do the same thing. I have a 2012 Avalanche LS that does NOT have 4LO.. So am I looking for the MP3023 transfer case? (From what I'm reading the 3024 is for the 2500, and the 3023 is for the 1500, correct?)
Also, just to verify, I'm not losing any functionality by doing this, such as stabilitrac or limiting the AWD function, am I?

All correct! Go for it!

 

[Tozan]

Like James said, everything should be working with the new unit.

 

[Brad Sponsel]

All correct! Go for it!

THANKS!!! I'm glad I found this post, I have been looking for this answer for some time!!

 

[swathdiver]

THANKS!!! I'm glad I found this post, I have been looking for this answer for some time!!

And you've got two guys here who've done it already, Charles and Justin, should you have any questions.

 

[Brad Sponsel]

Thanks!
By the way, can someone verifiy this: "Isn't the "Transmission Control Unit" really the transfer case module?"

 

[Brad Sponsel]

and where is the TCU located?

 

[swathdiver]

and where is the TCU located?

The Transfer Case Shift Control Module is under the dash on the driver's side.

 

[Brad Sponsel]

The Transfer Case Shift Control Module is under the dash on the driver's side.

THANKS!!!

 

[Brad Sponsel]

Transfer Case Shift Control Module

I think the reason I was getting confused on this is I kept looking up TCU or TCM and it kept coming up with "TRANSMISSION" control module, which is probably not the same as a TCCU "Transfer Case control module", correct?

 

[swathdiver]

I think the reason I was getting confused on this is I kept looking up TCU or TCM and it kept coming up with "TRANSMISSION" control module, which is probably not the same as a TCCU "Transfer Case control module", correct?

Yeah, the nomenclature can be confusing and changes depending on what your source material is. In the Tech-2 the transmission control module is called the TCM and the Transfer Case Control Module is called the TCCM. But when you read the various manuals the transmission's computer is now called TECHM, TCM, TECM, etc!

 

[Brad Sponsel]

QUESTION: Why do you need to replace the TCCM?
I have a 2012 Avalanche with the single speed transfer case..
I've been doing some research on the TCCM. I currently have the NPO transfer case and the existing TCCM is part number: 24261367.. I was thinking the NQH transfer case requires the 24252878, but when I went to find one I found a website that says that the one ending in 67 superscedes the one ending in 2978, so are they the same? https://www.wholesalegmpartsonline....fer-Case-Shift-Control/10546578/24261367.html

 

[Brad Sponsel]

https://www.wholesalegmpartsonline.com/showAssembly.aspx?ukey_assembly=386861&ukey_product=10546578
If you look at the attached link, they only give you one TCCM option (pn: 24261367) but 5 different options for the actual dashboard selector switch. Unless its a programming issue I'd think that the TCCM is the same for both the NQH (mp3023) and the NPO (mp3010) transfer case

 

[swathdiver]

https://www.wholesalegmpartsonline.com/showAssembly.aspx?ukey_assembly=386861&ukey_product=10546578
If you look at the attached link, they only give you one TCCM option (pn: 24261367) but 5 different options for the actual dashboard selector switch. Unless its a programming issue I'd think that the TCCM is the same for both the NQH (mp3023) and the NPO (mp3010) transfer case

The modules are the same when both have Magna transfer cases. It does appear that programming would be the difference. Notice that Charles used the TCCM from a donor vehicle, probably the same PN# but obviously different programming and likely not VIN dependent.