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Showing results for tags 'crown and pinion'.
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Hi all, I know its been done to death but I want to know what ratio to go for 3.89 or 4.11? I'm having a custom diff made which is a combination of...wait for it! A commodore/r31 centre housing (due to diff gears), ke70 axle housings, ef/el falcon lsd centre, r31 crown and pinion ratio's, ef/el axles shortened and re-splined and ef/el brakes (5 stud). I'm going to be running a 4agze, jdm big port rwd inlet, sc14, T50 (till it lets me know I shouldn't be) and some other goodies! I want good highway cruise rpm (so not screaming its guts out) but also want good acceleration, in saying that I don't want 1st gear to be rendered useless cos its too short, so I used gear calculator and the difference in RPM between the 4.11 and 3.89 is about 150RPM at 100km/h (obviously 150rpm lower for 3.89). Would this minimal difference be so noticeable if using it as a street car and for the odd hill climb? if not would it be 4.11 all the way!?
