To much power for clutch???
 

Ok. I was having an issue today driving home from work. My clutch was replace roughly 3 years/80,xxx miles ago. It was a southbend rated at 400 horse and 800 ft/lb. I have some upgrades done to my truck. See in the sig. The most recent being the Rv275 sticks. Felt like the clutch was slipping. Anyone think I might've maxed out the power range for the clutch?

I don't think you are past the power that clutch can hold. You are probably in the mid 300 hp range.