Which Supercharger should I go with?

[H2_SUT_SC]

If I lived anywhere close to IN or they had an LPE shop in Northern Cali I'd pay the $3k for the HD tranny upgrade. I figure once I blow it I'm going to have it trucked down there and have him swap it with the HD one.

Excuse my ignorance but what exactly will a shift kit or torque convertor do? I thought the CPU reprogram would change the shift limits.

Would any of those two options assist with getting additional HP to the ground??