Call/Email Dave a TripleEdgePerformance.com tell him I sent you. Dave is a great guy who is happy to talk through things, offer advice and explain what is going on. When you order the clutches etc.. you want some extra or thicker steels etc to take up the extra gap. GM doesn't give us a spec and the normal stack up leaves a lot of space in the clutch baskets. Which.... honestly sucks because then you have slower engagement times (like with worn clutches).