I have a 2002 prox 440 fan and I want way more low and and mid range with out losing to much top end any one know of what kind I should get ? let me know thanks.

Stock S-55, cut the heels for a 5000 rpm engagement, Stock almond red spring,R-7 helix, Erlandson Yellow driven spring 19-41 gears. Drop the mains down alittle.

Looks like someone has it down. Or try a HSP clutch kit.