Want to convert from T5 to auto transmission.

[landmass]

I have a 3.89 rear gear. In 4th gear at 80mph I'm at 4K on my tach, in 5th gear at 80mph I'm at 2800rpm on my tach, just at the beginning of my power curve and "smooth running". This being considered, do you guys think I need an AOD? Also, how to do correlate the gear ratios I have in 1rst, 2nd, 3rd and 4th, to a 3 speed automatic? How do I get the auto to run like the manual in terms of speed through the gears? Also, can I detune my auto tranny(can't go below 11secs) so it shifts at a lower rpm at the track, then change it back when I'm on the road? How does an MSD rev limiter affect shifting, since the rev limiter would be a logical way to reduce my track hp to stay above 11 seconds? Thank you.