This clutch kit is designed for High Performance and Heavy Duty applications.
It utilizes 6 thick GPZ clutches and 6 thick steels for a 48RE and 5 and 5 for a 47RE, by way of machining the pressure plate and piston, so it leaves the pressure plate as thick as possible so it will dissipate heat better.
Kolene steels can be added for High Performance applications, if needed.