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Tore down a friends C4, forward clutches were destroyed. Found a C5 drum, square cut C4 piston with a lip seal on it, Belleville spring, wavy snap ring and a C4 bottom pressure plate . I've found the correct pressure plate and the correct outer seal and plan on putting it back that way. However I've seen on the forum where people talk about eliminating the wave snap ring is there an advantage to this and how is it done? It's behind a 408 making about 450 hp. Thank you for your help.
 

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I see no advantage eliminating the wave ring.
The groove in a c5 drum is from memory .137" (Normal C4 groove = .087"). You'd have to use a thick plain ring and then make sure there is good tension on the belleville disc

The trap with using a C4 lower plate in a C5 drum is the large gap between the belleville and lower plate , hence lost apply pressure
 
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