4l80 billet input shaft
https://ftiperformance.com/300M-Bill...L85E-F8001.htm
For your power i would say you definitely need a billet clutch hub if you don't have one already and probably an upgraded drum as well if you don't already have one of those as well.
hub:
https://ftiperformance.com/TH400-Bil...-Hub-F4044.htm
drums:
https://ftiperformance.com/TH400-Alu...Pack-F4042.htm
https://ftiperformance.com/TH400-Alu...ague-F4040.htm
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