Jack shafts

#1
Does a jack shaft give you more torque so you can climb a hill or what is the purpose? I'm trying to build a bike or kart that would climb a hill. Or will a torque converter be the answer? I'm dumb to the subject.
 
#3
Will the torque converter give me the power to climb hills and are there different gear ratios on them. Can you run a shaft all the way through the pulley or does it not go all the way through?
 
#4
Depends on what it's for , a Tav 2 or 30 has the driven going to a sprocket (on the unit) I have some bikes with the driven on a jack shaft but they are separate units.
 
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