Could you advise me the Gearbox for Drag Racing with 550HP please?

I run a S9B gearbox at the moment.
1st question, How can I recognize it is a real S9B gearbox?

S9B Gearbox Ratios should be:
1st Gear 3.230
2nd Gear 1.900
3rd Gear 1.360
4th Gear 1.034
5th Gear 0.848
Final Drive 4.266

What about ITR Gearbox Ratio?

Thks

 

That trans should be fine for 550whp. Only really way to tell what trans it is, is pull it out, open the case and count the teeth on the gears.

 

Thank you, But I don't want to open the gearbox!

Where can I find ITR Gearbox ratio?

 

The S9b has LSD from factory
so when you look into the differential hole it should be empty
if not (see an cylindrical piece of metal) it's not a s9b
it's on of the best tranny for turbo long gear