Rsotak:
A more accurate question would be which axle for which track, current track conditions, your hubs, and which tire you’re running as well as the setup on your kart and your chassis brand itself for that matter….
I’m too new myself to be of much help to someone else – I’d suggest calling a professional (not being coy, being serious…I’m just learning all this myself by asking tons of questions and experimenting). Barry at Billet, AJ Noud w. Kartworks, Brad at IMI, or the Shockwave boys…all are great and will give you lots of help.