Now, I had alot of help getting this working from LS1 tech members and tons of info from a trans guy, wanted to let you know that first! thank you for the community for helping me out, i wired it in, tested it and ill show you how i did it.
Automatic Transmission, Forward Shift Pattern, Automatic/Manual Valve Body, Chevy, 4L80E, 1997-2006, Each. Part Number: TCI-271100 Not Yet Reviewed. 4L60E - 4L80E Trans Brake Operation. Brake will function in drive position, not manual low unless you are using a Ross-Lock™ patented hybrid manual box, and be disarmed in overdrive position. Never stall engine against converter with the brake applied for more than 3 to 4 seconds. Anything over 3 to 4 seconds will overheat fluid causing.
First of all I will explain, I am using this for foot brake turbo cars, 4l80e transmissions, i use tighter circle D stall converters for my street cars that will come up if you have really good brakes and other situations, what sucks is most of the time i am using 80s shitboxes, with poor brakes,
4l80e Transbrake D3
when i bring the car up into a brake stand i will push the back or front tire before i can get the boost and rpm i need to leave hard.
4l80e Performance Trans
well what happens here is you hit a switch and it forces the trans into high gear, removing the mechanical advantage you have over the tire, forcing the converter to hit its highest stall capability easily, and also when dropping back into 1st helps bump the tire and leave harder than just letting it roll off the brakes.
i used a 5 wire relay, what it does is leaves the trans connected and working normally, when you hit a switch it throws the 2-3 shift solenoid to ground, activating it.
then when you turn the switch off, (or monetary button etc) it will go back to normal and select first gear. and you will take off.
Rossler 4l80e Transbrake Instructions
here is the wiring diagram i wrote up for how i have it working on a 5 wire relay