Okay guys I'm wanting to do the swap. I'm going to either put a 0411 in or leave the black box for now. I realize they will have to be tuned but what EFI systems would be best for plug and play? I'm wanting to keep everything thing else stock so I don't have to change plugs and sensors. Also will a rebuilt stock trans hold up if the engine is pushing 400 hp?
Switching to a 0411 computer requires de-pinning and re-pinning correctly your harness to the new computer. It is not plug and play.
Only the stock based EFI system would be remotely plug and play. Nothing else is a drop in and go.
The factory injection system is good to approximately 400 hp, the injectors can only flow so much.
Wynjammer has different injection spiders available for more fuel flow in pounds per hour.
http://www.wynjammer.com/Vortec_Fuel_Injection_System.html
You WILL require custom programming based on what you want to do. Easier to keep the black box computer, Blackbear performance can tune it for you based on your input and combination.
http://blackbearperformance.com/
Sure you can rip out everything, go to a complete standalone system. This costs real money, and you will have to engineer solutions to other problems that crop up. If you aren't comfortable with a soldering iron and circuit schematics, and thinking on the fly, this is not for you.
A rebuilt transmission may or may not live behind that engine, it is dependent on many unknowns. 3-4 clutch packs are an issue with most all of these, the steels are far too thin and the cover flexes, forcing the discs into a cone shape.
THIS is a video of the above, at only 110 PSI apply pressure. 190+ will cause even greater deflection.
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Sonnax makes a HD part.
www.sonnax.com/parts/2451-smart-tech-input-housing-kit
Sure, you can put a 300M Maraging steel output shaft in the transmission, and change all sorts of components to make it live behind a lightweight 1000 hp car. Put the same transmission behind a 5200+ pound truck and decide to trash on the skinny pedal with a load on the truck and a trailer.... it will not like that.
Factory manifolds and Y-pipe aren't going to help out. You will need headers and full exhaust.
By the time you realize that dumping $2G into the transmission, another ~ $800 into the exhaust, then tuning, upgraded fuel pump, ~ $7-800 on a spider, plus the motor and YOUR labor, it quickly lacks feasability.
Not to mention, I would install a new radiator and transmission cooler at the time of the upgrade.
Not trying to dissuade you from taking this path if you desire, but there are better options, you could take that $6-7000 dollars you will spend and put it towards a newer vehicle. `