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There's nothing that would provide a tach signal in the CUCV. Nor is there a MAP or pedal sensor.

I haven't ever gotten a 4l80e yet. So I honestly haven't done a thing.

Another update. Tow/Haul mode. https://www.youtube.com/watch?v=sy-IBEU7eOg This code still does not contain any safety for the downshifting. I'm going to get a LCD screen next and start outputting some of the actions to the screen. Also I'll start pulling in RPM inputs once I build out that...

There's nothing done to the actual transmission or valve body for a 4l80e swap. Not sure what exactly you mean by re-engineered. None of the controllers out there have any special magic on how they control the transmission or in any way make it function differently. There is a lot of...

Agreed! The older I get, the less I want to do things the hard way.

I'm posting the code. I'll post the schematic as well when it's done. It's not complex at all. Not sure why you're pushing the us shift kit when the entire point of the thread is to open source/DIY.

Just looked at that kit. $585 for the unit. $140 for the harness. $100 for the TPS. Uno $10 3d printed case $0 LCD screen $10 4L80e plug/pigtail from junkyard $10 Shield prototype board $2 IRF540's $10 VR, buttons, misc $10 GM TPS $40 Basically about $100 in hardware.

I might move up to the mega, but thus far at least for the manual control, the code takes up 4% of a uno. I'm sure when I start fleshing this out with more functions, that space will be gobbled up. I'm thinking about later versions with the LCD screen and having inputs to toggle through RPM...

Certainly. The default start/failsafe setting will also be 2nd gear/TCC unlocked. But this code (and I can't stress it enough) is JUST for a proof of concept for now. The TPS, Engine RPM, and VSS will all be added onto this. So I'll probably end up using the 5V side of it for reference and...

Also I'm going to post a link over in the HMMWV section since this could also be used there too.

I've pretty much decided that the 4L80e is the path I'm going to take with my CUCV. But the $600+ for a controller stings. I've been tinkering with a arduino to control it. Right now this is only a proof of concept. The LEDs would actually be IRF540's to control the solenoids. There...