No more clutch piston or spring/retainer spinning in the drum.Features billet aluminum piston.Piston is attached to the clutch drum so there is 0 chance of spin out.Drum includes 8 full thickness clutches with red lining (not Alto) .Extra thick pressure plate and technical info .O/D of drum is lathe finished,new bushings,lip seals ,16 spring return spring assembly.Drops in.Call in for pricing.