Ok I understand that the suncoast transmission uses the alto clutch packs however... my builder is convinced that the raybestos clutches would be better. He has always used zpacks on everything and said they are just about the best. I am wondering how the z packs compare to the alto power packs that come with the stage 4 suncoast. Also does suncoast offer this option? On the raybestos z packs is the clutch count increased?

Raybestos Z pack is only available for the C2 clutch in the Allison. Their other clutches ( green color ) are stock replacement only and will not hold a lot of power. I am testing the new Raybestos red high performance clutches and they will be released to the rebuilders in the next few weeks.

ok thanks mike i appreciate all your help. what is the price of a 1057 and is this good for drag racing with a stock turbo?