I recently swapped out the T5 in my 94 Cobra for a used Tremec 3550. It only has about 200 miles on it since the swap. It now has vibration above 3,000 RPM that seems to get worse the higher you go. It doesn't seem to do it in neutral. I installed a resurfaced flywheel with all three dowels and a new Spec Stage 2 clutch. It also has new pilot and throwout bearings. After installing a slightly taller stock transmission mount and a spacer, the issue seems somewhat better, but still there. I know the pinon angle is still off because it starts vibrating pretty bad at around 70-75 mph, but this seems like a different issue. Could something be wrong with the clutch or flywheel? Transmission angle? Maybe a bent input shaft or mainshaft in the transmission? Any input is appreciated, thank you.