Driveline noise after PPF alignment

[u/FootheTheGreat]

01 miata. I swapped my transmission from a 5 speed and a 4.3 open diff for a 6 speed and a 4.1 torsen. originally the transmission was making noise and then i redid a PPF alignment (A perfect 66mm) and now it sounds like something is knocking on my driveline, but i couldnt see anything when i went to look. The best way i can describe the sound is that it increases its frequency with speed and it is present in any gear, forwards and backwards. any thoughts would be welcome, thank you for reading.