As described in prior posts, a clutch pack diff uses the clutch action ( between 23 -115 lb breakaway torque) as a servo mechanism to energise the centre pinion cross assembly that forces the hemisphere's to clamp the clutch pack with increased force to prevent wheel spin.

This PG setup may be good in a car with a combined mass of 100 kg, but above that its is a bit like the ZET turbo and other devices.
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