2000 mustang dissapointing

Comparing 4.10s to Supercharger is NO comparison. I know from experience.

I did notice a difference in the 4.10s however. I just don't like them with the KB. It's recommended for NA cars.

I never disliked my auto. It's just broken/slipping now so I figure I'd use this as an excuse to switch to T56. My car is mainly street driven anyways, so i figure a stick will be more fun.
 
All this talk about easily spinning tires just by pressing the gas has me worried about my stang! My tires are pretty bad, in the rain it is practically a struggle to not spin them but on dry pavement the only way I could spin the tires is to drop the clutch and I definitely couldn't do it at 50mph that's for sure. Any ideas what I should check? I take good care of my car, it's got pretty new plugs, cleaned maf, installed k&n, new fuel filter, synthetic oil in tranny and engine, I've run Seafoam thru it etc etc. I have no codes or anything.