So my dad and I installed my Stage 2 clutch and flywheel yesterday. Whole process went by pretty well as we have done clutch jobs before. So I go and test drive the Z...

Everything seemed normal as I started off in first. Soon as I hit 3rd gear and up, the transmission seemed to make an awfully loud grinding and rattling noise as i am accelerating, but no decrease in performance at all. What could it be?