6l90E 2wd 36 spline to 4X4 NP205 27 spline drive coupling idea???

[NDM]

I am moving this post to what should be the correct area.

I am curious why this idea that I have would not work. Please check my proposed idea.

I have my 72 that is getting a Gen V L8t 6.6 swap. Currently I am 4x4 but my new trans is 2wd 6l90e. I know I could find a 4x4 trans. I know I could convert the 6l90e to 4wd. But..... why could I not simply buy a new 27spline to 27 spline th350 to np205 drive coupler for about $50 and take it to a machine shop to have it resplined to 36 spline (to match the 6l90E). Then simply fabricate the required spacer/ adapter tube to bolt the two together like the timberline no cut adapter kit (1800 bucks). I am a welder/ fabricator so the adapter is not a problem.

Here is the replacement drive sleeve but I can get one much cheaper elsewhere. https://www.offroaddesign.com/drive-...27-spline.html

I am trying to retain the ability to go back to my SBC 350 in the future if I so desired. Once I machine my np205, no going back. Also, I really want to run my 6l90E. The modern motor and trans have 25k miles and were from the same truck. I am building a daily driver with the option for some future owner to go back to the OEM parts if they want to.

Why would my idea NOT WORK?

Fyi, for anyone wondering why not just buy the timberline kit.
1. It is $1800 (I am currently laid off from work)
2. It still requires machining the np205.
3. It comes with a male/female adapter and I need a female/female adapter.

Also, the parts and tools required to convert my 2wd 6l90e to 4x4 is about $400. I could pay the machine shop and still have cash for the material required to build the adapter tube for $400.

Here is the timberline adapter tube thing that I would fab up on my own.
https://timberlinesupply.com/product...conversion-kit