Can anyone please give me a simple explanation of any or all of the following:

Torque Converter
Stall
Shift Kit

This probably sounds like a pretty stupid question, but I'm new to the transmission sector of preformance cars/trucks and basically need information on what they will do for my 5.3L silverado. I have a general understanding of what they do from hearing people talk about them, but would like to know more about them. I greatly appreciate any advice
Thanks,
Ross

 

any advice......anyone?