not to steal your post but i was wondering what kind of rpms in relation to mph are you looking at like right now my car has 3.08 and at 70 im at 2,000rpms if i went to a 3.73 or 3.90 or 4.10 what would it be i think there was a sight aout some where that had a converter calculation. i have 275x45 r17
4.10s' Are CRAZY if you do ANY highway driving. With Minimal mods 3.73 on a 5spd car seem to be the preference. I am running 3.55 as I do alot of highway. Running the 1/4 I am crossing in 3rd gear at 6grand. 96 mph. Personal choice. but if I didn it again I'd go 3.73.