Dmarian907

Does anyone know if someone has made an input shaft yet for this tcase? Everywhere I read people haven't figured it out yet. I have an 07 scsb 5.3 4X4, doing a turbo so I need a 4l80e. I have a 4l80e out of an 05 ready to install help me out

Dmarian907

Anybody?

AKlowriderZ71

iTrader: (22)

I'm doing some digging for you Dillon. Looks like GM uses the MP3023 behind the 2ML70 (M99) hybrid transmission, and that version of the MP3023 uses a 32 spline input shaft. I'm trying to verify if the planetary is the same between both versions....

Here's a couple of links if you're interested.

http://www.ptcinc.ca/mrws/filedriver..._Operation.pdf

http://www.pickupwiki.com/sites/defa...ansferCase.pdf

AKlowriderZ71

iTrader: (22)

There are two part numbers for a MP3023 32 spline input gear, first design or second design. GM has a bulletin that explains in detail how to identify your transfer case. I copied the bulletin to my photobucket, I'll link it here in your thread. Both parts carry the same list price, $179.84

First design is P/N 19132978
Second design is P/N 19299088

Here's the bulletin:

Dmarian907

Thanks alot for the info, at first glance I thought I knew exactly what you were talking about but just reread it and realized I think I might be wrong. So are you saying I need the input spine gear out of a hybrid and input shaft too or no and also doesnt this also mean I could use an input shaft that is 32 spine to 27? Kinda like 32 to 29 for the awd tcase

AKlowriderZ71

iTrader: (22)

You need to figure out if your transfer case is a 1st or 2nd design case. Use the info in the bulletin to make that determination. Then order the appropriate input gear (32 spline).

First design is P/N 19132978
Second design is P/N 19299088

GXPJAY

I will have to check but is it safe to assume that my 07 NNBS ECSB 4x4 also has the Magna Transfer Case? If so I'm glad I read this I was going to order the Tcase input shaft from one of the write ups I read which I am sure is from a <NNBS series truck.

That is good info on determining which version I have and then I will order that input shaft.

**Edit**

Just re-read that bulletin and doesn't it say that the first design was used up until Dec 2011/Jan 2012 so anything before that especially a 2007 would be first design?

Dmarian907

Gxpjay are you sure because I've read it and the dealer has read it and I've never seen that

GXPJAY

I don't know what you mean but when I read the bulletin starting from the first line it says that in Dec 2011 and Jan 2012 they made a design change that included the Input shaft.....then further on it just keeps saying that they made the change for the 2012 model year truck......so clearly to me anyway a <2012 will be first design and in 2012 you could have first or second.

One thing worth noting I read in another thread someone did a 4L60E to 6L80E swap in a NNBS and they used the Tcase Input shaft from the 6L80E transfer case so that might be an option for us as well.

**Edit**
Here's the recent thread: https://www.performancetrucks.net/fo...s-swap-518742/

Hammer links to his swap thread with the part# for the input shaft which is 19132978 which coincidentally matches the part number in this thread provided by Roger for the First Design in the hybrid Tcase.

So, I would hopefully conclude that on my 07 NNBS I need 19132978 and I'm good to go.

GXPJAY

I wanted to update this thread to say that this morning I dropped by the trans shop doing my swap and they had successfully installed Part#19132978 in my stock Transfer Case.