Stock OEM clutch ratings (1 Viewer)

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Does anyone know the ratings of a stock OEM clutch for the 1hdft?
My 80 was optimized by a dyna test and torque is now 511 Nm at 1775 rpm.
BUT I have been doing a bit of light towing, and the clutch is now slipping in 4th around peak torque.
It as a genuine Toyota clutch with max 20K on it (4 years old), so it should now be worn.
I was thinking that the stock clutch should handle 511 Nm but I can't find any data related to these rating?
 

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