05-05-2020, 08:26 AM
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CC Member
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Join Date: Sep 2008
Location: Austin,
TX
Cobra Make, Engine: ERA FIA, 351W
Posts: 765
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Not Ranked
if you go to a tko600 (with a 2.87 first gear), I'd leave your 3.31 gears alone. If you keep your toploader, i'd might keep the 3.31 gears also, i.e. your first gear is kind of a 2nd gear; I'd rather have that than having a 4rth gear that revs you so high at 60-70 mph.
Given power and weight, I think the optimal first gear final drive, i.e. 1st gear ratio x rear gear ratio, to be in the 8.0-9.0 area - that way you get a nice pull in first, not just 20-25 mph and then have to shift. I like to be able to get up to 50 mph in first at about 5000-5500 rpms.
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