whats the difference between s20 b000 and p9a b000?

 

S20 has aluminum shift forks, S40 (P9A) has steel shift forks.

S20 has 1.900 2nd gear. S40 has 1.909 (1.781 if its an HX)

S40 has a few more parts still available from Honda. S20 has a ton of parts discontinued from Honda.

 

P9A B000 comes from d15z6, what the gear ratios?3.250, 1909, 1.25, 909, 702, 3.89 !?

 

I'm not sure what the ratios are.