Well...after a year of abuse in my 4 mil cub pushing 90ish HP on Jeff's FAST clutch and 6HD springs, that clutch managed to make it two plus full seasons of drag racing on the same inner and outer with light springs and a lockup...so...maybe it was the clutch, maybe it was the fluid, not sure....but I abused the hell out of my clutch in the dunes, etc., and I'm a big guy...