I know this is in the wrong area, but I am posting this here as the 8L90E was not an option on this engine.

I am very new to tuning, and I'm wanting to see if this would be something possible to accomplish through HPT? I have a 2017 Colorado 2.8 Duramax 2WD and am wanting to swap the trans to a 4WD 8L90e. The big reason for the swap is I plan on running a compound turbo setup, and the price of an 8L90 vs building a 6L50 to attempt to handle the power is astronomical. Plus if I can gain a few extra gears, why wouldn't I. I know that the V6 runs the 8L45 so the platform has an 8 speed, but I would really like to attempt to run the 8L90E.

Thank you in advance for the newb questions!

Kevin