1st gear will be to short with a 4.10. you won't make it under the traffic light before shipping. A 12.3 to 1 starting line ratio is too deep. A 3.73 or 3.55 will put upk in the 10.5 to 11.2 range and is more accepatable.
Also, if you were to try to autocross a 4.10 gear, 12:1 starting line ratio, you will find yourself between 1st and 2nd gear all the time. on the drag strip you will just roast the tires.
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Frank Serafine
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