Researching 4L80E to NV4500 Transmission Swap

[DmaxMaverick]

Simply, it will work as-is. However, because it's a SUV, it may have some features that are ECM dependent not present on a pickup. Much depends on the year model and optioned features. There are no manual tranny SUV's, so there will be no out-of-the-box solution. If you just plug it in and run it, you will see a continuous SES lamp, and may be forced into limp mode (not at a time of your choosing).

I do not recommend "pulling the bulb", as the SES lamp is a diagnostic tool that will alert you of other, more serious issues that may lead to damage, or worse.

What I would suggest......
Keep It Simple (and probably less expensive, all told). Contact Kennedy and purchase a power chip. He can adjust the program to eliminate the transmission monitoring (and other annoying EPA required features), while remaining specific to your model. A little boost in power and economy would be an added bonus.

[trbankii]

Ok, that makes sense. I was starting to see my search for an ECM to swap in becoming a lost cause. Most of the ECMs on eBay say to swap in your current chips - or just give a part number and say that you’re responsible for determining if it is an applicable use.

The other option would be to do the MFI swap. That would eliminate all the electronics...

[trbankii]

What all are the differences between a Turbo and a NA MFI 6.5?

I know the Turbo uses the short body injectors for clearance and that the precups are different, but are there any other major differences?

I have a line on a parts truck with a NA MFI 6.5 in it. My thought is to use it for an MFI conversion for the Yukon, so I’d mainly be looking at stripping off the MFI components from the donor engine to transplant onto the Yukon engine - IP, lines, and front timing cover. But I’d keep the turbo that’s in the Yukon.

I’m also looking to swap in an NV4500 so that I don’t have to deal with computer issues with the 4L80E.

[DmaxMaverick]

It depends on the chassis model and year. All van and many step van chassis have a different upper engine. The injector angles aren't the only thing. The heads and intake will be different (60 vs. 90* bolts). I've not seen it done, but I don't think you can use your current turbo config. Van and most chassis are center mount.

[trbankii]

Would a van or chassis engine affect the IP and lines? I guess it would affect the lines due to the injector angles?

[DmaxMaverick]

Yes. They require different injector lines. The difference is significant, so slight modification (which shouldn't be done, anyway) is not an option.

[trbankii]

Sounds like I should keep looking. Thank you for the advice.