What Diff Ratio Should I Use?

[o0o]

like the title,...

actually i don't know what diff i got on my ceffy atm(gonna find that out tomorrow^^)

my ceffy was auto trans and i put a manual box in there...

when i ride 3000rpm in 5 gear i'm straight on 100km/h...but normally it should be 2000-2500rpm be for 100km/h or?

so i think i gotta change the crown wheel and that other thing(forgot the name )

i don't know alot about that so i'm asking u guys...my car will be driven daily and sometimes drifted on funny days^^

i'm not planning to build a HP-MONSTER, just get nistune and a lil bigger turbo in there in future to let my tires smoke

that ratio would you guy's suggest me lol? cause on long range driving i gonna need much more fuel

[toffy]

they're pretty good on fuel for the rpm , i would assume you have a 4.36:1 diff ratio , the lowest i would go with an rb20 would be 4.11:1 which will drop your rpm down about 300rpm in top gear

[o0o]

hmm ok if you think that would be good i gonna look out for a 4.36:1:D

btw anybody knows how much teeth the crownwheel has for a 4.36:1 ratio? i'm not sure but lsd's are hard to find here cause of that getting one from outside would be easy but postage is expensive so i would like to buy just the crownwheel and the another thing^^